Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Threshold ownership percentage for inter company balances and transactions elimination	100.00%
Cumulative effect of change in accounting principles	$ 1,938
Expected lease-up periods for estimating lost rentals, in months	6 months
Percentage of ordinary taxable income to be distributed for real estate investment trust qualification	90.00%	90.00%	90.00%
Number of years of federal income tax at corporate rates on failure to qualify as REIT	4 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset	$ 80,000
Operating lease, liability	$ 80,000
Maximum [Member]
Significant Accounting Policies [Line Items]
Stock award vesting period in years	10 years
Operating lease, right-of-use asset	$ 90,000
Operating lease, liability	$ 90,000
Time-Based Awards [Member]
Significant Accounting Policies [Line Items]
Stock award vesting period in years	3 years
Market Conditions Based Awards [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Stock award vesting period in years	3 years
Market Conditions Based Awards [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Stock award vesting period in years	5 years
Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principles	$ 2,000