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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Apr. 30, 2011 | May 31, 2009 | Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2009 | Jan. 31, 2009 | Apr. 30, 2013 Single_Stream_Material_Recovery_Facilities Executives | Apr. 30, 2012 | Apr. 30, 2011 | Nov. 13, 2012 D | May 31, 2011 | Jan. 18, 2011 | Jan. 30, 2009 | Apr. 30, 2006 Agreement | Apr. 30, 2004 Agreement | Dec. 20, 2000 acre | Apr. 30, 2013 Maximum [Member] | Apr. 30, 2013 Minimum [Member] | Sep. 30, 2011 Waste Stream Inc [Member] | Nov. 30, 2011 Motors Liquidation Trust [Member] | Apr. 30, 2013 Financing lease obligations [Member] | Apr. 30, 2012 Financing lease obligations [Member] | Apr. 30, 2011 Financing lease obligations [Member]
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of financial lease obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Financial lease obligation, fixed rate of interest |  |  |  |  |  |  | 6.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,213 | $ 3,213 |
Depreciation expense on property, plant and equipment |  |  |  |  |  |  | 34,065 | 37,829 | 35,939 |  |  |  |  |  |  |  |  |  |  |  | 293 | 293 | 293
Number of single stream MRFs |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating facilities and equipment under operating leases |  |  |  |  |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rent expense under operating leases charged to operations |  |  |  |  |  |  | 5,372 | 5,213 | 5,109 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of landfill operation and management agreements |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 3 |  |  |  |  |  |  |  |
Depletion expense on operating lease contracts |  |  |  |  |  |  | 9,372 | 8,482 | 7,878 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disputed invoice amount |  |  |  |  |  |  |  |  |  |  | 3,195 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate finance asserting liability total |  |  |  |  |  |  |  |  |  |  |  | 3,852 |  |  |  |  |  |  |  |  |  |  |
Taxation payable |  |  |  |  |  |  |  |  |  |  |  | 2,220 |  |  |  |  |  |  |  |  |  |  |
Penalties and interest payable |  |  |  |  |  |  |  |  |  |  |  | 1,632 |  |  |  |  |  |  |  |  |  |  |
Payment of alleged actual or potential tax deficiencies |  |  |  |  |  |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment allocated for tax |  |  |  |  |  |  | 430 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment allocated for interest |  |  |  |  |  |  | 370 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scrap yard and solid waste transfer station |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |
Undiscounted costs associated with implementing preferred remedies |  | 10,219 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Present worth cost associated with implementing preferred remedies | 12,130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enter into a Consent Order with DEC |  |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation charge |  |  | 549 | 335 | 1,532 | 2,823 |  |  | 549 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of environmental remediation cost |  |  |  |  | 15.00% |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |
Environmental remediation liability |  |  |  |  |  |  | 5,297 | 5,210 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion expense |  |  |  |  |  |  | 138 | 138 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of risk free interest rate |  |  |  |  |  |  | 2.70% | 2.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future remediation costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000 | 100 |  |  |
Number of executive officers |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial term of employment contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 1 year |  |  |  |  |
Covenant range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years | 1 year |  |  |  |  |
Total annual commitments for salaries |  |  |  |  |  |  | $ 1,201 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salary and bonuses payment range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 1 year |  |  |  |  |

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