Preliminary Allocations of Aggregate Purchase Price (Parenthetical) (Detail) (2013 Acquisitions, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]  
Property, plant and equipment $ 41,942
Landfill
 
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]  
Property, plant and equipment $ 24,000