Condensed Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jan. 04, 2011
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	$ 1,275,846	$ 1,255,876
Real estate held for sale		17,637
Mortgage loans	265,000	165,000
Net investment in direct financing leases	201,156
Gross investment in real estate assets	1,742,002	1,438,513
Accumulated depreciation and amortization	(119,271)	(101,851)
Net investment in real estate assets	1,622,731	1,336,662
Cash & cash equivalents	127,639	102,726	227,906	98,408
Interest and rent receivable	38,038	29,862
Straight-line rent receivable	36,973	33,993
Other loans	159,718	74,839
Other assets	53,432	43,792
Total Assets	2,038,531	1,621,874
Debt, net	900,204	689,849
Accounts payable and accrued expenses	59,087	51,125
Deferred revenue	22,496	23,307
Lease deposits and other obligations to tenants	29,161	28,778
Total liabilities	1,010,948	793,059
Total equity	1,027,583	828,815
Total Liabilities and Equity	2,038,531	1,621,874
Parent
Condensed Financial Statements, Captions [Line Items]
Net intercompany receivable (payable)	26,728	21,955
Investment in subsidiaries	1,027,973	829,205
Total Assets	1,054,701	851,160
Accounts payable and accrued expenses	27,118	22,345
Total liabilities	27,118	22,345
Total equity	1,027,583	828,815
Total Liabilities and Equity	1,054,701	851,160
Subsidiary Issuers
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	69	37
Gross investment in real estate assets	69	37
Net investment in real estate assets	69	37
Cash & cash equivalents	125,655	101,230	227,288	96,822
Interest and rent receivable	513	399
Other loans	177	178
Net intercompany receivable (payable)	1,229,630	872,380
Investment in subsidiaries	554,473	489,858
Other assets	32,800	27,285
Total Assets	1,943,317	1,491,367
Debt, net	885,889	635,820
Accounts payable and accrued expenses	28,931	25,783
Deferred revenue	524	559
Total liabilities	915,344	662,162
Total equity	1,027,973	829,205
Total Liabilities and Equity	1,943,317	1,491,367
Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,209,831	1,189,891
Mortgage loans	165,000	165,000
Gross investment in real estate assets	1,374,831	1,354,891
Accumulated depreciation and amortization	(113,670)	(97,100)
Net investment in real estate assets	1,261,161	1,257,791
Cash & cash equivalents	1,565	1,409	477	1,387
Interest and rent receivable	25,677	22,529
Straight-line rent receivable	31,164	28,928
Other loans		5,491
Net intercompany receivable (payable)	(846,533)	(867,536)
Investment in subsidiaries	42,912	43,008
Other assets	1,520	2,151
Total Assets	517,466	493,771
Debt, net		39,600
Accounts payable and accrued expenses	2,362	2,581
Deferred revenue	20,830	21,499
Lease deposits and other obligations to tenants	28,125	28,258
Total liabilities	51,317	91,938
Total equity	466,149	401,833
Total Liabilities and Equity	517,466	493,771
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	65,946	65,948
Real estate held for sale		17,637
Mortgage loans	100,000
Net investment in direct financing leases	201,156
Gross investment in real estate assets	367,102	83,585
Accumulated depreciation and amortization	(5,601)	(4,751)
Net investment in real estate assets	361,501	78,834
Cash & cash equivalents	419	87	141	199
Interest and rent receivable	11,848	6,934
Straight-line rent receivable	5,809	5,065
Other loans	159,541	69,170
Net intercompany receivable (payable)	(409,825)	(26,799)
Other assets	19,112	14,356
Total Assets	148,405	147,647
Debt, net	14,315	14,429
Accounts payable and accrued expenses	676	416
Deferred revenue	1,142	1,249
Lease deposits and other obligations to tenants	1,036	520
Total liabilities	17,169	16,614
Total equity	131,236	131,033
Total Liabilities and Equity	148,405	147,647
Eliminations
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries	(1,625,358)	(1,362,071)
Total Assets	(1,625,358)	(1,362,071)
Total equity	(1,625,358)	(1,362,071)
Total Liabilities and Equity	(1,625,358)	(1,362,071)
Total Consolidated
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,275,846	1,255,876
Real estate held for sale		17,637
Mortgage loans	265,000	165,000
Net investment in direct financing leases	201,156
Gross investment in real estate assets	1,742,002	1,438,513
Accumulated depreciation and amortization	(119,271)	(101,851)
Net investment in real estate assets	1,622,731	1,336,662
Cash & cash equivalents	127,639	102,726	227,906	98,408
Interest and rent receivable	38,038	29,862
Straight-line rent receivable	36,973	33,993
Other loans	159,718	74,839
Other assets	53,432	43,792
Total Assets	2,038,531	1,621,874
Debt, net	900,204	689,849
Accounts payable and accrued expenses	59,087	51,125
Deferred revenue	22,496	23,307
Lease deposits and other obligations to tenants	29,161	28,778
Total liabilities	1,010,948	793,059
Total equity	1,027,583	828,815
Total Liabilities and Equity	$ 2,038,531	$ 1,621,874