Fair Value of Assets and Liabilities (Details) $ in Thousands	Sep. 30, 2015 USD ($) shares
Travel Centers of America LLC
Fair Value of Assets and Liabilities
Shares included in investment securities \| shares	3,420,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Travel Centers of America LLC
Fair Value of Assets and Liabilities
Shares included in investment securities \| shares	3,420,000
Historical cost of securities	$ 17,407
Recurring
Fair Value of Assets and Liabilities
Investment securities	35,329
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value of Assets and Liabilities
Investment securities	$ 35,329

Balance held at close of period in number of shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

-Subparagraph (SX 210.12-12C.Column B)

-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.Column B)

-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.Column B)

-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

Name:	us-gaap_InvestmentOwnedBalanceShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant