SUPPLEMENTAL CONDENSED COMBINING FINANCIAL INFORMATION - Condensed Combining Balance Sheet (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Real Estate:
Land	$ 320,808,000	$ 345,473,000
Buildings and improvements	224,003,000	270,381,000
Total real estate	544,811,000	615,854,000
Less - accumulated depreciation and amortization	(114,678,000)	(137,117,000)
Real estate, net	453,851,000	478,737,000
Net investment in direct financing leases	92,110,000	92,632,000
Deferred rent receivable, net	10,938,000	8,080,000
Cash and cash equivalents	16,387,000	7,698,000	14,009,000	6,122,000
Notes, mortgages and accounts receivable, net	35,919,000	36,083,000
Other assets	30,328,000	11,859,000
Total assets	639,533,000	635,089,000
LIABILITIES:
Borrowings under credit line	151,700,000	147,700,000
Term loan	22,225,000	22,810,000
Environmental remediation costs	52,300,000	57,700,000		14,874,000
Accounts payable and accrued liabilities	38,148,000	34,710,000
Total liabilities	268,575,000	262,920,000
Net assets (liabilities)		372,169,000
Getty Petroleum Marketing [Member]
Real Estate:
Land		131,077,000
Buildings and improvements		170,553,000
Total real estate		301,630,000
Less - accumulated depreciation and amortization		(107,478,000)
Real estate, net		194,152,000
Notes, mortgages and accounts receivable, net		5,743,000
Total assets		199,895,000
LIABILITIES:
Environmental remediation costs		57,416,000
Accounts payable and accrued liabilities		4,002,000
Total liabilities		61,418,000
Net assets (liabilities)		138,477,000
Other Tenants [Member]
Real Estate:
Land		214,396,000
Buildings and improvements		99,479,000
Total real estate		313,875,000
Less - accumulated depreciation and amortization		(29,448,000)
Real estate, net		284,427,000
Net investment in direct financing leases		92,632,000
Deferred rent receivable, net		8,080,000
Notes, mortgages and accounts receivable, net		28,262,000
Other assets		7,611,000
Total assets		421,012,000
LIABILITIES:
Environmental remediation costs		284,000
Accounts payable and accrued liabilities		19,564,000
Total liabilities		19,848,000
Net assets (liabilities)		401,164,000
Corporate [Member]
Real Estate:
Buildings and improvements		349,000
Total real estate		349,000
Less - accumulated depreciation and amortization		(191,000)
Real estate, net		158,000
Cash and cash equivalents		7,698,000	14,009,000	6,122,000
Notes, mortgages and accounts receivable, net		2,078,000
Other assets		4,248,000
Total assets		14,182,000
LIABILITIES:
Borrowings under credit line		147,700,000
Term loan		22,810,000
Accounts payable and accrued liabilities		11,144,000
Total liabilities		181,654,000
Net assets (liabilities)		$ (167,472,000)