Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]
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
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock award vesting period in years	10 years
Consolidated Entities [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	100.00%
Time-Based Awards [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock award vesting period in years	3 years
Market Conditions Based Awards [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock award vesting period in years	3 years
Market Conditions Based Awards [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock award vesting period in years	5 years