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Business Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended | 5 Months Ended
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Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2010 | Apr. 30, 2013 Property | Apr. 30, 2012 Property | Apr. 30, 2011 | Apr. 30, 2013 Minimum [Member] Y | Apr. 30, 2012 Minimum [Member] Y | Apr. 30, 2013 Maximum [Member] Y | Apr. 30, 2012 Maximum [Member] Y | Apr. 30, 2013 Business Acquisition [Member] | Apr. 30, 2012 Business Acquisition [Member] | Apr. 30, 2013 Bestway Disposal Services And BBI Waste Services [Member] | Apr. 30, 2013 Bestway Disposal Services And BBI Waste Services [Member] Class A Common Stock [Member] | Apr. 30, 2013 BBI Acquisition [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 5,631 |  |  |  | $ 2,217 |  |  |  |  |  |  |  | $ 5,631 | $ 2,217 |  |  |  |  |  |  |  | $ 22,375 |  |
Business acquisition, cash | 5,080 |  |  |  | 2,102 |  |  |  |  |  |  |  | 5,080 | 2,102 |  |  |  |  |  |  |  | 19,725 |  |
Business acquisition, hold backs to sellers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 551 | 115 |  |  |
Business acquisition, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 625 |
Business acquisition, stock value | (2,650) |  |  |  |  |  |  |  |  |  |  |  | (2,650) |  |  |  |  |  |  |  |  | 2,650 |  |
Goodwill not expected to be deductible for tax purpose |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,916 |  |
Number of business acquired |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 5 |  |  |  |  |  |  |  |  |  |
Acquired intangible assets, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 5 | 10 | 10 |  |  |  |  |
Deferred tax liability recorded through goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,084
Revenues | $ 108,694 | $ 112,167 | $ 116,836 | $ 117,638 | $ 106,375 | $ 111,520 | $ 125,989 | $ 124,066 | $ 106,772 | $ 109,076 | $ 119,694 | $ 119,143 | $ 455,335 | $ 467,950 | $ 454,685 |  |  |  |  |  |  |  |  | $ 7,281

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- Definition The amount of goodwill arising from a business combination that is not expected to be deductible for tax purposes. + References No definition available. + Details
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- Definition Amount of acquisition cost of a business combination allocated to deferred tax assets and deferred tax liabilities. + References No definition available. + Details
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- Definition Amount of potential cash payments that could result from the contingent consideration arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 99-12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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