PROPERTY ACQUISITIONS - Additional Information (Detail) (USD $)	1 Months Ended		1 Months Ended					1 Months Ended
	Jan. 31, 2011 CPD NY [Member]	Jan. 31, 2011 CPD NY [Member] Land [Member]	Jan. 31, 2011 CPD Lease [Member] Terms	Jan. 31, 2011 CPD Loan [Member]	Mar. 31, 2011 Nouria Lease [Member] Terms	Mar. 31, 2011 Nouria Loan [Member]	Jan. 31, 2011 CPD NY energy corp [Member] Property	Jan. 31, 2011 ExxonMobil [Member] Property	Mar. 31, 2011 Nouria Energy Ventures [Member] Property	Mar. 31, 2011 Nouria [Member]	Mar. 31, 2011 Nouria [Member] Land [Member]
Business Acquisition [Line Items]
The number of Mobil-branded gasoline stations in which we took a security interest							59
Sale/leaseback transaction investment							$ 111,621,000		$ 87,047,000
Acquisition of real estate assets								65	66
Sale/leaseback, initial term in years			15 years		20 Years
Sale/leaseback number of renewal terms			3		2
The number of years in the final renewal term for Nouria				10 years
Purchase price allocation, assets acquired		60,610,000									37,875,000
Leasehold interest as Lessee accounted as deferred asset	953,000									3,895,000
Leasehold interest as Lessor accounted as deferred liability	2,516,000									3,768,000
Purchase price allocated to direct financing and capital lease assets	38,752,000									37,315,000
Purchase price accounted for in notes, mortgages and accounts receivable, net	18,400,000									12,000,000
Capital Lease obligation	5,768,000									1,114,000
Transaction Cost related to acquisition	$ 1,190,000									$ 844,000
Self amortizing loan term	10 years
Extendable maturity period for each renewable term						Ten years