Condensed Consolidating Financial Information - Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	$ 2,061,183	$ 1,865,455
Mortgage loans	385,093	388,756
Investment in direct financing leases	436,386	431,024
Gross investment in real estate assets	2,882,662	2,685,235
Accumulated depreciation and amortization	(191,282)	(159,776)
Net investment in real estate assets	2,691,380	2,525,459
Cash and cash equivalents	132,812	45,979	12,124	37,311
Interest and rent receivables	50,240	58,565
Straight-line rent receivables	56,403	45,829
Other loans	147,418	160,990
Other assets	90,887	67,873
Total Assets	3,169,140	2,904,695
Debt, net	1,618,981	1,421,681
Accounts payable and accrued expenses	85,426	94,290
Deferred revenue	30,830	24,114
Lease deposits and other obligations to tenants	26,797	20,402
Total liabilities	1,762,034	1,560,487
Total equity	1,407,106	1,344,208
Total Liabilities and Equity	3,169,140	2,904,695
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net intercompany receivable	(2,004,301)	(1,942,837)
Investment in subsidiaries	(2,380,036)	(2,212,158)
Total Assets	(4,384,337)	(4,154,995)
Net intercompany payable	(2,004,302)	(1,942,837)
Total liabilities	(2,004,302)	(1,942,837)
Total equity	(2,380,035)	(2,212,158)
Total Liabilities and Equity	(4,384,337)	(4,154,995)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net intercompany receivable	35,839	35,363
Investment in subsidiaries	1,407,495	1,344,598
Total Assets	1,443,334	1,379,961
Accounts payable and accrued expenses	36,229	35,753
Total liabilities	36,229	35,753
Total equity	1,407,105	1,344,208
Total Liabilities and Equity	1,443,334	1,379,961
Subsidiary Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	108,105	18,815	11,391	35,483
Interest and rent receivables	791	336
Other loans		178
Net intercompany receivable	1,968,462	1,907,474
Investment in subsidiaries	930,769	825,153
Other assets	44,516	37,311
Total Assets	3,052,643	2,789,267
Debt, net	1,605,230	1,407,733
Accounts payable and accrued expenses	40,235	36,887
Deferred revenue	214	232
Lease deposits and other obligations to tenants	(531)	(183)
Total liabilities	1,645,148	1,444,669
Total equity	1,407,495	1,344,598
Total Liabilities and Equity	3,052,643	2,789,267
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,995,236	1,796,415
Mortgage loans	285,093	285,106
Investment in direct financing leases	214,709	212,543
Gross investment in real estate assets	2,495,038	2,294,064
Accumulated depreciation and amortization	(181,739)	(151,624)
Net investment in real estate assets	2,313,299	2,142,440
Cash and cash equivalents	23,786	27,094		1,565
Interest and rent receivables	19,198	31,492
Straight-line rent receivables	44,633	37,015
Other loans	1,100	1,100
Investment in subsidiaries	41,772	42,407
Other assets	744	1,096
Total Assets	2,444,532	2,282,644
Accounts payable and accrued expenses	8,265	20,500
Net intercompany payable	1,593,090	1,556,634
Deferred revenue	24,432	17,866
Lease deposits and other obligations to tenants	23,097	18,163
Total liabilities	1,648,884	1,613,163
Total equity	795,648	669,481
Total Liabilities and Equity	2,444,532	2,282,644
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	65,947	69,040
Mortgage loans	100,000	103,650
Investment in direct financing leases	221,677	218,481
Gross investment in real estate assets	387,624	391,171
Accumulated depreciation and amortization	(9,543)	(8,152)
Net investment in real estate assets	378,081	383,019
Cash and cash equivalents	921	70	733	263
Interest and rent receivables	30,251	26,737
Straight-line rent receivables	11,770	8,814
Other loans	146,318	159,712
Other assets	45,627	29,466
Total Assets	612,968	607,818
Debt, net	13,751	13,948
Accounts payable and accrued expenses	697	1,150
Net intercompany payable	411,212	386,203
Deferred revenue	6,184	6,016
Lease deposits and other obligations to tenants	4,231	2,422
Total liabilities	436,075	409,739
Total equity	176,893	198,079
Total Liabilities and Equity	$ 612,968	$ 607,818