Condensed Consolidating Financial Information - Condensed Consolidated Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net cash provided by (used in) operating activities	$ 50,255	$ 56,245
Investing activities
Cash paid for acquisitions and other related investments	(115,000)	(75,000)
Principal received on loans receivable	6,829	3,293
Net proceeds from sale of real estate		18,409
Investments in loans receivable	(5,601)	(1,300)
Construction in progress and other	(55,159)	(33,171)
Net cash used for investing activities	(168,931)	(87,769)
Financing activities
Revolving credit facilities, net	(105,000)	(85,000)
Additions to term debt, net of discount	425,000
Payments of term debt	(100,132)	(11,124)
Distributions paid	(71,809)	(57,846)
Proceeds from sale of common shares/units, net of offering costs	128,332	172,853
Lease deposits and other obligations to tenants	4,910	1,516
Debt issuance costs paid and other financing activities	(11,496)	(114)
Net cash provided by financing activities	269,805	20,285
Increase (decrease) in cash and cash equivalents for period	151,129	(11,239)
Effects of exchange rate changes on cash	(85)
Cash and cash equivalents at beginning of period	45,979	37,311
Cash and cash equivalents at end of period	197,023	26,072
Parent [Member]
Operating activities
Net cash provided by (used in) operating activities	(35)	(35)
Financing activities
Distributions paid	(71,686)	(57,712)
Proceeds from sale of common shares/units, net of offering costs	128,332	172,853
Net payments relating to intercompany financing	(56,611)	(115,106)
Net cash provided by financing activities	35	35
Subsidiary Issuers [Member]
Operating activities
Net cash provided by (used in) operating activities	(41,011)	(29,090)
Investing activities
Construction in progress and other	(382)	(621)
Net cash used for investing activities	(382)	(621)
Financing activities
Revolving credit facilities, net	(105,000)	(85,000)
Additions to term debt, net of discount	425,000
Payments of term debt	(100,000)	(11,000)
Distributions paid	(71,809)	(57,846)
Proceeds from sale of common shares/units, net of offering costs	128,332	172,853
Lease deposits and other obligations to tenants	(404)	(159)
Net payments relating to intercompany financing	(122,015)	1,417
Debt issuance costs paid and other financing activities	(11,496)	(114)
Net cash provided by financing activities	142,608	20,151
Increase (decrease) in cash and cash equivalents for period	101,215	(9,560)
Cash and cash equivalents at beginning of period	18,815	35,483
Cash and cash equivalents at end of period	120,030	25,923
Subsidiary Guarantors [Member]
Operating activities
Net cash provided by (used in) operating activities	106,136	83,872
Investing activities
Cash paid for acquisitions and other related investments	(115,000)	(75,000)
Construction in progress and other	(53,671)	(33,144)
Net cash used for investing activities	(168,671)	(108,144)
Financing activities
Lease deposits and other obligations to tenants	3,645	558
Net payments relating to intercompany financing	58,586	22,149
Net cash provided by financing activities	62,231	22,707
Increase (decrease) in cash and cash equivalents for period	(304)	(1,565)
Effects of exchange rate changes on cash	(85)
Cash and cash equivalents at beginning of period	27,094	1,565
Cash and cash equivalents at end of period	26,705
Non-Guarantor Subsidiaries [Member]
Operating activities
Net cash provided by (used in) operating activities	(14,835)	1,498
Investing activities
Principal received on loans receivable	6,829	3,293
Net proceeds from sale of real estate		18,409
Investments in loans receivable	(5,601)	(1,300)
Construction in progress and other	(1,106)	594
Net cash used for investing activities	122	20,996
Financing activities
Payments of term debt	(132)	(124)
Lease deposits and other obligations to tenants	1,669	1,117
Net payments relating to intercompany financing	63,394	(23,601)
Net cash provided by financing activities	64,931	(22,608)
Increase (decrease) in cash and cash equivalents for period	50,218	(114)
Cash and cash equivalents at beginning of period	70	263
Cash and cash equivalents at end of period	50,288	149
Eliminations [Member]
Financing activities
Distributions paid	71,686	57,712
Proceeds from sale of common shares/units, net of offering costs	(128,332)	(172,853)
Net payments relating to intercompany financing	$ 56,646	$ 115,141