Condensed Consolidating Financial Information - Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	$ 2,026,259	$ 1,865,455
Mortgage loans	385,100	388,756
Investment in direct financing leases	434,311	431,024
Gross investment in real estate assets	2,845,670	2,685,235
Accumulated depreciation and amortization	(178,262)	(159,776)
Net investment in real estate assets	2,667,408	2,525,459
Cash and cash equivalents	197,023	45,979	26,072	37,311
Interest and rent receivables	46,353	58,565
Straight-line rent receivables	51,193	45,829
Other loans	140,470	160,990
Net intercompany receivable	0	0
Investment in subsidiaries	0	0
Other assets	87,597	67,873
Total Assets	3,190,044	2,904,695
Debt, net	1,640,353	1,421,681
Accounts payable and accrued expenses	84,231	94,290
Net intercompany payable	0	0
Deferred revenue	27,425	24,114
Lease deposits and other obligations to tenants	25,081	20,402
Total liabilities	1,777,090	1,560,487
Total equity	1,412,954	1,344,208
Total Liabilities and Equity	3,190,044	2,904,695
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net intercompany receivable	35,785	35,363
Investment in subsidiaries	1,413,344	1,344,598
Total Assets	1,449,129	1,379,961
Accounts payable and accrued expenses	36,175	35,753
Total liabilities	36,175	35,753
Total equity	1,412,954	1,344,208
Total Liabilities and Equity	1,449,129	1,379,961
Subsidiary Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	120,030	18,815	25,923	35,483
Interest and rent receivables	832	336
Other loans		178
Net intercompany receivable	2,028,913	1,907,474
Investment in subsidiaries	880,837	825,153
Other assets	46,340	37,311
Total Assets	3,076,952	2,789,267
Debt, net	1,626,537	1,407,733
Accounts payable and accrued expenses	37,438	36,887
Deferred revenue	220	232
Lease deposits and other obligations to tenants	(587)	(183)
Total liabilities	1,663,608	1,444,669
Total equity	1,413,344	1,344,598
Total Liabilities and Equity	3,076,952	2,789,267
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	1,959,605	1,796,415
Mortgage loans	285,100	285,106
Investment in direct financing leases	213,966	212,543
Gross investment in real estate assets	2,458,671	2,294,064
Accumulated depreciation and amortization	(169,260)	(151,624)
Net investment in real estate assets	2,289,411	2,142,440
Cash and cash equivalents	26,705	27,094		1,565
Interest and rent receivables	18,655	31,492
Straight-line rent receivables	40,900	37,015
Other loans	1,100	1,100
Investment in subsidiaries	43,159	42,407
Other assets	857	1,096
Total Assets	2,420,787	2,282,644
Accounts payable and accrued expenses	10,103	20,500
Net intercompany payable	1,620,097	1,556,634
Deferred revenue	21,046	17,866
Lease deposits and other obligations to tenants	21,579	18,163
Total liabilities	1,672,825	1,613,163
Total equity	747,962	669,481
Total Liabilities and Equity	2,420,787	2,282,644
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Land, buildings and improvements and intangible lease assets	66,654	69,040
Mortgage loans	100,000	103,650
Investment in direct financing leases	220,345	218,481
Gross investment in real estate assets	386,999	391,171
Accumulated depreciation and amortization	(9,002)	(8,152)
Net investment in real estate assets	377,997	383,019
Cash and cash equivalents	50,288	70	149	263
Interest and rent receivables	26,866	26,737
Straight-line rent receivables	10,293	8,814
Other loans	139,370	159,712
Other assets	40,400	29,466
Total Assets	645,214	607,818
Debt, net	13,816	13,948
Accounts payable and accrued expenses	515	1,150
Net intercompany payable	444,601	386,203
Deferred revenue	6,159	6,016
Lease deposits and other obligations to tenants	4,089	2,422
Total liabilities	469,180	409,739
Total equity	176,034	198,079
Total Liabilities and Equity	645,214	607,818
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net intercompany receivable	(2,064,698)	(1,942,837)
Investment in subsidiaries	(2,337,340)	(2,212,158)
Total Assets	(4,402,038)	(4,154,995)
Net intercompany payable	(2,064,698)	(1,942,837)
Total liabilities	(2,064,698)	(1,942,837)
Total equity	(2,337,340)	(2,212,158)
Total Liabilities and Equity	$ (4,402,038)	$ (4,154,995)