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Goodwill and Intangible Assets - Schedule of Activity and Balances Related to Goodwill (Parenthetical) (Detail) (Eastern Region [Member], BBI Waste Industries and Bestway Disposal Services [Member], USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Oct. 31, 2013
Eastern Region [Member] | BBI Waste Industries and Bestway Disposal Services [Member] |
Goodwill And Intangible Assets [Line Items] |
Adjustment related to the December 5, 2012 | $ 61
Business acquisition date | Dec. 05, 2012

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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