Goodwill and Intangible Assets - Schedule of Activity and Balances Related to Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	$ 119,170
Other	(194)
Goodwill, ending balance	118,976
Recycling [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	12,315
Goodwill, ending balance	12,315
Other [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	1,729
Goodwill, ending balance	1,729
Eastern Region [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	17,429
Goodwill, ending balance	17,429
Western Region [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	87,697
Other	(194)
Goodwill, ending balance	$ 87,503