Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	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	24,100		23,700
Capitalized transaction costs	1,300
Proceeds from insurance claims, operating activities	1,809	$ 4,482
Proceeds from insurance claims, investing activities	2,335	590
Distributions of capital from unconsolidated joint ventures	110	530
Distributions of income from unconsolidated joint ventures	1,732	1,270
Reported Value Measurement
Significant Accounting Policies [Line Items]
Mortgage notes payable fair value	2,251,100		2,193,700
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Mortgage notes payable fair value	2,230,700		2,184,000
Leases, Acquired-in-Place
Significant Accounting Policies [Line Items]
Intangible assets	84,400		76,700
Accumulated amortization of identified intangible assets	$ 77,600		76,500
Accounting Standard Update 2016-15
Significant Accounting Policies [Line Items]
Proceeds from insurance claims, investing activities		$ 600
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Retained earnings			$ 15,200