Condensed Consolidating Financial Information - Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Real estate held for sale		$ 25,537
Net investment in direct financing leases	431,024	314,412
Mortgage loans	388,650	368,650
Gross investment in real estate assets	2,685,129	1,959,839
Net investment in real estate assets	2,525,353	1,837,043
Cash and cash equivalents	45,979	37,311	102,726	98,408
Interest and rent receivables	58,499	45,289
Straight-line rent receivables	45,829	35,860
Other loans	160,990	159,243
Other assets	67,920	64,140
Total Assets	2,904,570	2,178,886
Debt, net	1,421,681	1,025,160
Accounts payable and accrued expenses	94,311	65,961
Deferred revenue	23,787	20,609
Lease deposits and other obligations to tenants	20,583	17,342
Total liabilities	1,560,362	1,129,072
Total Equity	1,344,208	1,049,814
Total Liabilities and Equity	2,904,570	2,178,886
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets
Real estate held for sale
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	35,363	27,393
Investment in subsidiaries	1,344,598	1,050,204
Total Assets	1,379,961	1,077,597
Debt, net
Accounts payable and accrued expenses	35,753	27,783
Net intercompany payable
Deferred revenue
Lease deposits and other obligations to tenants
Total liabilities	35,753	27,783
Total Equity	1,344,208	1,049,814
Total Liabilities and Equity	1,379,961	1,077,597
Subsidiary Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets		28
Real estate held for sale
Net investment in direct financing leases
Mortgage loans
Gross investment in real estate assets		28
Accumulated depreciation and amortization
Net investment in real estate assets		28
Cash and cash equivalents	18,815	35,483	101,230	96,822
Interest and rent receivables	336	212
Straight-line rent receivables
Other loans	178	177
Net intercompany receivable	1,907,477	1,373,941
Investment in subsidiaries	825,153	647,029
Other assets	37,311	31,097
Total Assets	2,789,267	2,087,967
Debt, net	1,407,733	1,010,962
Accounts payable and accrued expenses	36,887	26,658
Net intercompany payable
Deferred revenue	49	143
Lease deposits and other obligations to tenants
Total liabilities	1,444,669	1,037,763
Total Equity	1,344,598	1,050,204
Total Liabilities and Equity	2,789,267	2,087,967
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,795,084	1,185,265
Real estate held for sale
Net investment in direct financing leases	212,543	110,155
Mortgage loans	268,650	268,650
Gross investment in real estate assets	2,276,277	1,564,070
Accumulated depreciation and amortization	(151,624)	(116,344)
Net investment in real estate assets	2,124,653	1,447,726
Cash and cash equivalents	27,094	1,565	1,409	1,387
Interest and rent receivables	31,324	29,150
Straight-line rent receivables	37,015	28,416
Other loans	1,100
Net intercompany receivable
Investment in subsidiaries	42,407	42,666
Other assets	1,168	1,522
Total Assets	2,264,761	1,551,045
Debt, net
Accounts payable and accrued expenses	20,367	10,492
Net intercompany payable	1,538,934	997,231
Deferred revenue	17,772	19,431
Lease deposits and other obligations to tenants	17,964	16,357
Total liabilities	1,595,037	1,043,511
Total Equity	669,724	507,534
Total Liabilities and Equity	2,264,761	1,551,045
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	70,371	65,947
Real estate held for sale		25,537
Net investment in direct financing leases	218,481	204,257
Mortgage loans	120,000	100,000
Gross investment in real estate assets	408,852	395,741
Accumulated depreciation and amortization	(8,152)	(6,452)
Net investment in real estate assets	400,700	389,289
Cash and cash equivalents	70	263	87	199
Interest and rent receivables	26,839	15,927
Straight-line rent receivables	8,814	7,444
Other loans	159,712	159,066
Net intercompany receivable
Investment in subsidiaries
Other assets	29,441	31,521
Total Assets	625,576	603,510
Debt, net	13,948	14,198
Accounts payable and accrued expenses	1,304	1,028
Net intercompany payable	403,903	404,103
Deferred revenue	5,966	1,035
Lease deposits and other obligations to tenants	2,619	985
Total liabilities	427,740	421,349
Total Equity	197,836	182,161
Total Liabilities and Equity	625,576	603,510
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets
Real estate held for sale
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	(1,942,837)	(1,401,334)
Investment in subsidiaries	(2,212,158)	(1,739,899)
Total Assets	(4,154,995)	(3,141,233)
Debt, net
Accounts payable and accrued expenses
Net intercompany payable	(1,942,837)	(1,401,334)
Deferred revenue
Lease deposits and other obligations to tenants
Total liabilities	(1,942,837)	(1,401,334)
Total Equity	(2,212,158)	(1,739,899)
Total Liabilities and Equity	(4,154,995)	(3,141,233)
Total Consolidated [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,865,455	1,251,240
Real estate held for sale		25,537
Net investment in direct financing leases	431,024	314,412
Mortgage loans	388,650	368,650
Gross investment in real estate assets	2,685,129	1,959,839
Accumulated depreciation and amortization	(159,776)	(122,796)
Net investment in real estate assets	2,525,353	1,837,043
Cash and cash equivalents	45,979	37,311	102,726	98,408
Interest and rent receivables	58,499	45,289
Straight-line rent receivables	45,829	35,860
Other loans	160,990	159,243
Net intercompany receivable
Investment in subsidiaries
Other assets	67,920	64,140
Total Assets	2,904,570	2,178,886
Debt, net	1,421,681	1,025,160
Accounts payable and accrued expenses	94,311	65,961
Net intercompany payable
Deferred revenue	23,787	20,609
Lease deposits and other obligations to tenants	20,583	17,342
Total liabilities	1,560,362	1,129,072
Total Equity	1,344,208	1,049,814
Total Liabilities and Equity	$ 2,904,570	$ 2,178,886