Condensed Consolidating Financial Information - Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements, and intangible lease assets	$ 2,008,422	$ 1,865,455
Net investment in direct financing leases	432,657	431,024
Mortgage loans	388,650	388,650
Gross investment in real estate assets	2,829,729	2,685,129
Accumulated depreciation and amortization	(173,475)	(159,776)
Net investment in real estate assets	2,656,254	2,525,353
Cash and cash equivalents	50,309	45,979	75,675	37,311
Interest and rent receivables	63,174	58,499
Straight-line rent receivables	48,023	45,829
Other loans	141,552	160,990
Net intercompany receivable
Investment in subsidiaries
Other assets	67,280	67,920
Total Assets	3,026,592	2,904,570
Debt, net	1,472,045	1,421,681
Accounts payable and accrued expenses	74,184	94,311
Net intercompany payable
Deferred revenue	25,419	23,787
Lease deposits and other obligations to tenants	23,964	20,583
Total liabilities	1,595,612	1,560,362
Total Equity	1,430,980	1,344,208
Total Liabilities and Equity	3,026,592	2,904,570
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements, and intangible lease assets
Net investment in direct financing leases
Mortgage loans
Gross investment in real estate assets
Accumulated depreciation and amortization
Net investment in real estate assets
Cash and cash equivalents
Interest and rent receivables
Straight-line rent receivables
Other loans
Net intercompany receivable	35,608	35,363
Investment in subsidiaries	1,431,370	1,344,598
Other assets
Total Assets	1,466,978	1,379,961
Debt, net
Accounts payable and accrued expenses	35,998	35,753
Net intercompany payable
Deferred revenue
Lease deposits and other obligations to tenants
Total liabilities	35,998	35,753
Total Equity	1,430,980	1,344,208
Total Liabilities and Equity	1,466,978	1,379,961
Subsidiary Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements, and intangible lease assets
Net investment in direct financing leases
Mortgage loans
Gross investment in real estate assets
Accumulated depreciation and amortization
Net investment in real estate assets
Cash and cash equivalents	31,104	18,815	73,827	35,483
Interest and rent receivables	537	336
Straight-line rent receivables
Other loans	178	178
Net intercompany receivable	1,999,835	1,907,474
Investment in subsidiaries	851,636	825,153
Other assets	36,088	37,311
Total Assets	2,919,378	2,789,267
Debt, net	1,458,165	1,407,733
Accounts payable and accrued expenses	29,974	36,887
Net intercompany payable
Deferred revenue	(131)	49
Lease deposits and other obligations to tenants
Total liabilities	1,488,008	1,444,669
Total Equity	1,431,370	1,344,598
Total Liabilities and Equity	2,919,378	2,789,267
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements, and intangible lease assets	1,940,880	1,796,411
Net investment in direct financing leases	213,244	212,543
Mortgage loans	288,650	288,650
Gross investment in real estate assets	2,442,774	2,297,604
Accumulated depreciation and amortization	(164,898)	(151,624)
Net investment in real estate assets	2,277,876	2,145,980
Cash and cash equivalents	18,564	27,094	1,566	1,565
Interest and rent receivables	32,735	31,462
Straight-line rent receivables	38,416	37,015
Other loans	1,100	1,100
Net intercompany receivable
Investment in subsidiaries	42,326	42,407
Other assets	1,169	1,165
Total Assets	2,412,186	2,286,223
Debt, net
Accounts payable and accrued expenses	7,713	20,522
Net intercompany payable	1,649,895	1,560,039
Deferred revenue	19,373	17,785
Lease deposits and other obligations to tenants	20,265	18,139
Total liabilities	1,697,246	1,616,485
Total Equity	714,940	669,738
Total Liabilities and Equity	2,412,186	2,286,223
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements, and intangible lease assets	67,542	69,044
Net investment in direct financing leases	219,413	218,481
Mortgage loans	100,000	100,000
Gross investment in real estate assets	386,955	387,525
Accumulated depreciation and amortization	(8,577)	(8,152)
Net investment in real estate assets	378,378	379,373
Cash and cash equivalents	641	70	282	263
Interest and rent receivables	29,902	26,701
Straight-line rent receivables	9,607	8,814
Other loans	140,274	159,712
Net intercompany receivable
Investment in subsidiaries
Other assets	30,023	29,444
Total Assets	588,825	604,114
Debt, net	13,880	13,948
Accounts payable and accrued expenses	499	1,149
Net intercompany payable	385,548	382,798
Deferred revenue	6,177	5,953
Lease deposits and other obligations to tenants	3,699	2,444
Total liabilities	409,803	406,292
Total Equity	179,022	197,822
Total Liabilities and Equity	588,825	604,114
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements, and intangible lease assets
Net investment in direct financing leases
Mortgage loans
Gross investment in real estate assets
Accumulated depreciation and amortization
Net investment in real estate assets
Cash and cash equivalents
Interest and rent receivables
Straight-line rent receivables
Other loans
Net intercompany receivable	(2,035,443)	(1,942,837)
Investment in subsidiaries	(2,325,332)	(2,212,158)
Other assets
Total Assets	(4,360,775)	(4,154,995)
Debt, net
Accounts payable and accrued expenses
Net intercompany payable	(2,035,443)	(1,942,837)
Deferred revenue
Lease deposits and other obligations to tenants
Total liabilities	(2,035,443)	(1,942,837)
Total Equity	(2,325,332)	(2,212,158)
Total Liabilities and Equity	$ (4,360,775)	$ (4,154,995)