Property and Equipment, Net (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 33,624
Landfill Site Costs
Property, Plant and Equipment [Line Items]
Landfill depletion expense	$ 143,940	$ 82,369	$ 84,308