Condensed Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jan. 04, 2011
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	$ 1,251,909	$ 1,217,559
Real estate held for sale	17,432	48,925
Mortgage loans	368,650	165,000
Net investment in direct financing leases	312,050
Gross investment in real estate assets	1,950,041	1,431,484
Accumulated depreciation and amortization	(120,215)	(94,822)
Net investment in real estate assets	1,829,826	1,336,662
Cash & cash equivalents	36,163	102,726	114,368	98,408
Interest and rent receivable	42,094	29,862
Straight-line rent receivable	38,065	33,993
Other loans	158,177	74,839
Other assets	54,074	43,792
Total Assets	2,158,399	1,621,874
Debt, net	1,025,183	689,849
Accounts payable and accrued expenses	64,297	51,125
Deferred revenue	20,374	23,307
Lease deposits and other obligations to tenants	15,387	28,778
Total liabilities	1,125,241	793,059
Total equity	1,033,158	828,815
Total Liabilities and Equity	2,158,399	1,621,874
Parent
Condensed Financial Statements, Captions [Line Items]
Net intercompany receivable (payable)	26,750	21,955
Investment in subsidiaries	1,033,548	829,205
Total Assets	1,060,298	851,160
Accounts payable and accrued expenses	27,140	22,345
Total liabilities	27,140	22,345
Total equity	1,033,158	828,815
Total Liabilities and Equity	1,060,298	851,160
Subsidiary Issuers
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	42	37
Gross investment in real estate assets	42	37
Net investment in real estate assets	42	37
Cash & cash equivalents	34,371	101,230	113,132	96,822
Interest and rent receivable	540	399
Other loans	176	178
Net intercompany receivable (payable)	1,410,629	872,380
Investment in subsidiaries	602,443	489,858
Other assets	32,330	27,285
Total Assets	2,080,531	1,491,367
Debt, net	1,010,925	635,820
Accounts payable and accrued expenses	35,958	25,783
Deferred revenue	100	559
Total liabilities	1,046,983	662,162
Total equity	1,033,548	829,205
Total Liabilities and Equity	2,080,531	1,491,367
Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,185,920	1,151,574
Real estate held for sale	17,432	22,008
Mortgage loans	268,650	165,000
Net investment in direct financing leases	110,000
Gross investment in real estate assets	1,582,002	1,338,582
Accumulated depreciation and amortization	(114,188)	(90,072)
Net investment in real estate assets	1,467,814	1,248,510
Cash & cash equivalents	1,565	1,409
Interest and rent receivable	27,881	22,528
Straight-line rent receivable	31,882	27,388
Other loans		5,491
Net intercompany receivable (payable)	(1,039,740)	(862,281)
Investment in subsidiaries	43,693	43,008
Other assets	1,148	2,151
Total Assets	534,243	488,204
Debt, net		39,600
Accounts payable and accrued expenses	731	2,578
Deferred revenue	18,796	21,372
Lease deposits and other obligations to tenants	14,372	28,103
Total liabilities	33,899	91,653
Total equity	500,344	396,551
Total Liabilities and Equity	534,243	488,204
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	65,947	65,948
Real estate held for sale		26,917
Mortgage loans	100,000
Net investment in direct financing leases	202,050
Gross investment in real estate assets	367,997	92,865
Accumulated depreciation and amortization	(6,027)	(4,750)
Net investment in real estate assets	361,970	88,115
Cash & cash equivalents	227	87	1,236	1,586
Interest and rent receivable	13,673	6,935
Straight-line rent receivable	6,183	6,605
Other loans	158,001	69,170
Net intercompany receivable (payable)	(397,639)	(32,054)
Other assets	20,596	14,356
Total Assets	163,011	153,214
Debt, net	14,258	14,429
Accounts payable and accrued expenses	468	419
Deferred revenue	1,478	1,376
Lease deposits and other obligations to tenants	1,015	675
Total liabilities	17,219	16,899
Total equity	145,792	136,315
Total Liabilities and Equity	163,011	153,214
Eliminations
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries	(1,679,684)	(1,362,071)
Total Assets	(1,679,684)	(1,362,071)
Total equity	(1,679,684)	(1,362,071)
Total Liabilities and Equity	(1,679,684)	(1,362,071)
Total Consolidated
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,251,909	1,217,559
Real estate held for sale	17,432	48,925
Mortgage loans	368,650	165,000
Net investment in direct financing leases	312,050
Gross investment in real estate assets	1,950,041	1,431,484
Accumulated depreciation and amortization	(120,215)	(94,822)
Net investment in real estate assets	1,829,826	1,336,662
Cash & cash equivalents	36,163	102,726	114,368	98,408
Interest and rent receivable	42,094	29,862
Straight-line rent receivable	38,065	33,993
Other loans	158,177	74,839
Other assets	54,074	43,792
Total Assets	2,158,399	1,621,874
Debt, net	1,025,183	689,849
Accounts payable and accrued expenses	64,297	51,125
Deferred revenue	20,374	23,307
Lease deposits and other obligations to tenants	15,387	28,778
Total liabilities	1,125,241	793,059
Total equity	1,033,158	828,815
Total Liabilities and Equity	$ 2,158,399	$ 1,621,874