Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accounts payable related to construction in progress	$ 16,600	$ 12,500
Receivable and reduction of real estate assets, net - related to hurricane casualty	5,700	0
Dividends declared	78,687	75,400	$ 78,549
Conversion of Operating Partnership Units	$ 900	$ 0