Property and Equipment, Net (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Landfill Site Costs [Member]
Property, Plant and Equipment [Line Items]
Landfill depletion expense	$ 82,369	$ 84,308	$ 80,227