Summary of Significant Accounting Policies - Schedule of Fee and Other Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Management and other fee income	$ 33,641	$ 36,298	$ 32,971
Ancillary and other property income	16,819	18,678	19,038
Lease termination fees	10,505	3,512	2,774
Other	170	80	565
Total fee and other income	$ 61,135	$ 58,568	$ 55,348