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Goodwill and Intangible Assets - Schedule of Activity and Balances Related to Goodwill (Parenthetical) (Detail) (Eastern Region [Member], Bestway Disposal Services and BBI Waste Services [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Jan. 31, 2014
Eastern Region [Member] | Bestway Disposal Services and BBI Waste Services [Member] |
Goodwill And Intangible Assets [Line Items] |
Adjustment related to the December 5, 2012 | $ 33
Business acquisition date | Dec. 05, 2012

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