SUPPLEMENTAL CONDENSED COMBINING FINANCIAL INFORMATION - Condensed Combining Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Real Estate Properties [Line Items]
Revenues from rental properties	$ 22,386	$ 24,954	$ 76,332	$ 72,917
Interest on notes and mortgages receivable	726	755	2,107	1,901
Total revenues	23,112	25,709	78,439	74,818
Operating expenses:
Rental property expenses	8,345	2,923	22,044	10,094
Impairment charges	2,000	550	2,979	2,470
Environmental expenses, net		1,734		3,878
General and administrative expenses	4,963	2,687	26,141	10,308
Allowance for deferred rent receivable		10,974		10,974
Depreciation and amortization expense	3,329	2,714	10,152	6,998
Total operating expenses	18,905	21,582	61,674	44,722
Operating income (loss)	4,207	4,127	16,765	30,096
Other income, net	211	122	503	79
Interest expense	(2,896)	(1,414)	(7,071)	(4,079)
Earnings (loss) from continuing operations	1,522	2,835	10,197	26,096
Discontinued operations:
Income from operating activities	(5,563)	2,205	(7,370)	5,233
Gains on dispositions of real estate	576	310	3,819	609
Earnings from discontinued operations	(4,987)	2,515	(3,551)	5,842
Net earnings (loss)	(3,465)	5,350	6,646	31,938
Getty Petroleum Marketing [Member]
Real Estate Properties [Line Items]
Revenues from rental properties		12,148		37,122
Total revenues		12,148		37,122
Operating expenses:
Rental property expenses		1,357		4,054
Impairment charges		550		957
Environmental expenses, net		1,694		3,782
General and administrative expenses		12		109
Allowance for deferred rent receivable		10,974		10,974
Depreciation and amortization expense		1,174		2,918
Total operating expenses		15,761		22,794
Operating income (loss)		(3,613)		14,328
Other income, net				20
Earnings (loss) from continuing operations		(3,613)		14,348
Discontinued operations:
Income from operating activities		2,178		5,097
Gains on dispositions of real estate				299
Earnings from discontinued operations		2,178		5,396
Net earnings (loss)		(1,435)		19,744
Other Tenants [Member]
Real Estate Properties [Line Items]
Revenues from rental properties		12,806		35,795
Interest on notes and mortgages receivable		716		1,800
Total revenues		13,522		37,595
Operating expenses:
Rental property expenses		1,480		5,663
Impairment charges				1,513
Environmental expenses, net		40		96
General and administrative expenses		16		2,240
Depreciation and amortization expense		1,530		4,049
Total operating expenses		3,066		13,561
Operating income (loss)		10,456		24,034
Earnings (loss) from continuing operations		10,456		24,034
Discontinued operations:
Income from operating activities		27		136
Gains on dispositions of real estate		310		310
Earnings from discontinued operations		337		446
Net earnings (loss)		10,793		24,480
Corporate [Member]
Real Estate Properties [Line Items]
Interest on notes and mortgages receivable		39		101
Total revenues		39		101
Operating expenses:
Rental property expenses		86		377
General and administrative expenses		2,659		7,959
Depreciation and amortization expense		10		31
Total operating expenses		2,755		8,367
Operating income (loss)		(2,716)		(8,266)
Other income, net		122		59
Interest expense		(1,414)		(4,079)
Earnings (loss) from continuing operations		(4,008)		(12,286)
Discontinued operations:
Net earnings (loss)		$ (4,008)		$ (12,286)