Contingent Consideration of Obligations Related to Previous Acquisitions (Detail) (R360 Environmental Solutions Inc, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Business Acquisition [Line Items]
Contingent consideration	$ 37,293
Prairie Disposal
Business Acquisition [Line Items]
Contingent consideration	24,376
Oilfield Holdings
Business Acquisition [Line Items]
Contingent consideration	8,000
Calpet
Business Acquisition [Line Items]
Contingent consideration	4,176
Claco Services
Business Acquisition [Line Items]
Contingent consideration	$ 741

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details