Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Intangible assets and goodwill	$ 12,100		$ 12,100		$ 12,100
Intangible assets	4,300		4,300		4,300
Goodwill	7,800		7,800		7,800
Accumulated amortization of identified intangible assets	2,900		2,900		2,800
Amortization of in-place leases	138	$ 1,376	2,128	$ 2,139
Cash and cash equivalents, restricted cash	5,300		5,300		5,300
Deferred financing costs, net	18,900		$ 18,900		18,900
Primary Beneficiary
Significant Accounting Policies [Line Items]
Ownership percentage			93.70%
Reported Value Measurement
Significant Accounting Policies [Line Items]
Mortgage notes payable fair value	2,200,100		$ 2,200,100		2,110,200
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Mortgage notes payable fair value	2,225,400		2,225,400		2,081,200
Leases, Acquired-in-Place
Significant Accounting Policies [Line Items]
Intangible assets	76,700		76,700		76,300
Accumulated amortization of identified intangible assets	$ 76,400		$ 76,400		$ 74,300