Some countries and territories around the globe granted visa-free or visa on arrival access to Indonesian passport holders. If the country or territory is not mentioned below, most likely pre-arranged visa is needed. Contacting embassy of related country is very helpful as some documentaries are needed, mainly invitation letter/hotel booking receipt, bank statement, etc.
However, contacting related embassy to double-check visa requirement might be helpful prior to departure to the intended country as immigration policy might change anytime without prior online announcement.
Also note that validity of passport, even for visa-free visit, should be at least 6 months from date of arrival, although some countries also allow 3 months.
Visa requirements for Indonesian citizens are as follows;
The map shows distribution of countries around the globe that are granting Indonesian citizens a visa free or otherwise stated.
Visa must be obtained prior to departure from appropriate embassy but free of charge only for diplomatic passport holder 
Diplomatic and/or Service Passports Agreement
Map showing distribution of countries granting visa free for short stay for Indonesian diplomatic and service passport holders.pngThe map is updated as of January 2014, with France being the newest country to sign such agreement. If the country/countries have signed visa waiver/visa on arrival, then the country/countries will appear on the first map on the top page
Although visa is generally needed by Indonesian citizens (who hold ordinary passport), some countries apply visa waiver program providing that Indonesian passport holders also have some specific visas (mainly USA/UK/Schengen/Australia/New Zealand visas). Some countries who apply such rule are mentioned below:
Albania: All foreign nationals who have a valid multi – entry Schengen visa, type “C” or “D”, or a valid residence permit in one of the Schengen member states, can enter, stay and transit Albania without visa, within the validity term of the visa or the residence permit 
Andorra: Andorra does not require any entry visa, but any person required to have a visa for the Schengen territory to enter Spain or France must be sure that their visa allows multi-entry if they want to travel to Andorra .
Anguilla: Providing that Indonesian citizens also possess a valid visa issued by U.K. Please read additional information.
Bosnia and Herzegovina: 7 days max. for Indonesian passport holder who have a valid residence permit issued by a Schengen country 
Costa Rica: Those holding a visa (valid for at least 3 months beyond the date of arrival) for an EU Member State, Canada, Japan, Korea (Rep.of) or USA, for a max.stay of 90 days, for nationals of Indonesia.
Dominican Republic: Holders of a visa issued by Canada, USA or any EU Member State can obtain a Tourist Card for a max. stay of 30 days. Fee: USD 10.-. Extension possible.
Honduras: Holders of a valid visa for Canada, the USA or a Schengen Member State for nationals of Indonesia.
Kosovo: Foreign citizens, subject to visa regime application, but bearers of valid multiple entry Schengen visa may enter the Republic of Kosovo and stay up to 15 days without having to obtain a Kosovo visa .
Mexico: Providing that Indonesian citizen is also permanent resident in Canada, Japan, the United Kingdom, the United States, or the Schengen countries. From May 1, 2010, it is not necessary to apply for a Mexican visa if you hold a valid visa from the United States of America, regardless of the nationality. Immigration authorities in Mexico will ask for your US visa and a valid passport when you arrive.
Montenegro: A max. stay of 7 days for holders of a visa issued by a Schengen Member State or U.S.A., or not longer than the expiry of the visa, if the validity of the visa is less than 7 days.
Panama: Providing that Indonesian has valid visa of the following countries: USA/UK/Canada/Australia/any member countries of the EU, which has been used at least once to enter those countries AND must buy tourist card that is of USD 30 on arrival.
South Korea: Providing that Indonesian has valid visa of the following countries: USA/UK/Canada/Australia/New Zealand and is travelling between one of those countries to/from a third country and hold a confirmed onward ticket departing within 30 days.
Taiwan: Providing that Indonesian citizens also possess a valid visa or permanent residence certificate issued by U.S.A., Canada, Japan, U.K., Schengen Convention countries, Australia or New Zealand.