Changes In Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of real estate accumulated depreciation [Roll Forward]
Accumulated Depreciation, Beginning Balance	$ 1,282,423	$ 1,169,492	$ 1,058,540
Depreciation expense	117,400	113,609	111,065
Amortization of in-place leases	3,373	2,358	3,999
Dispositions and other	(3,665)	(3,036)	(4,112)
Accumulated Depreciation, Ending Balance	1,399,531	1,282,423	1,169,492
Rental home depreciation expense	$ 10,700	$ 10,675	$ 10,900