Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Intangible assets and goodwill	$ 12,100			$ 12,100
Intangible assets	4,300			4,300
Goodwill	7,800			7,800
Accumulated amortization of identified intangible assets	3,000			2,900
Cash and cash equivalents, restricted cash	5,300			5,300
Deferred financing costs, net	23,600			23,700
Capitalized transaction costs	1,500
Proceeds from insurance claims, operating activities	(3,353)	$ (134)
Proceeds from insurance claims, investing activities	6,615	1,547
Distributions of income from unconsolidated joint ventures	2,869	2,071
Distributions in excess of accumulated earnings			$ (227,166)	(211,980)
Reported Value Measurement
Significant Accounting Policies [Line Items]
Mortgage notes payable fair value	2,238,400			2,193,700
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Mortgage notes payable fair value	2,200,800			2,184,000
Leases, Acquired-in-Place
Significant Accounting Policies [Line Items]
Intangible assets	84,900			76,700
Accumulated amortization of identified intangible assets	$ 81,700			$ 76,500
Accounting Standards Update 2016-15
Significant Accounting Policies [Line Items]
Distributions of capital from unconsolidated joint ventures		$ 600
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Distributions in excess of accumulated earnings			$ (15,186)