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Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 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 | Apr. 30, 2012 | Apr. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside 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
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 56,576 | 58,415 | 58,121
Operating income (loss) | 2,110 | 78 | 4,426 | 5,807 | (37,679) | 4,448 | 11,730 | 10,468 | (2,324) | 6,571 | 12,263 | 12,918 | 12,421 | (11,033) | 29,428
Interest expense (net) |  |  |  |  |  |  |  |  |  |  |  |  | 41,429 | 44,966 | 45,489
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 54,761 | 58,363 | 54,728
Goodwill | 115,928 |  |  |  | 101,706 |  |  |  | 101,204 |  |  |  | 115,928 | 101,706 | 101,204
Total assets | 659,627 |  |  |  | 633,743 |  |  |  | 690,581 |  |  |  | 659,627 | 633,743 | 690,581
Eastern region [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside revenues |  |  |  |  |  |  |  |  |  |  |  |  | 168,361 | 163,063 | 158,856
Inter-company revenue |  |  |  |  |  |  |  |  |  |  |  |  | 33,738 | 35,616 | 38,238
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 24,410 | 25,993 | 25,081
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (3,504) | (42,130) | (3,978)
Interest expense (net) |  |  |  |  |  |  |  |  |  |  |  |  | 26,509 | 31,019 | 23,195
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 21,854 | 22,207 | 24,600
Goodwill | 16,858 |  |  |  | 58 |  |  |  | 38 |  |  |  | 16,858 | 58 | 38
Total assets | 210,889 |  |  |  | 177,185 |  |  |  | 223,229 |  |  |  | 210,889 | 177,185 | 223,229
Western region [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside revenues |  |  |  |  |  |  |  |  |  |  |  |  | 205,747 | 212,227 | 207,345
Inter-company revenue |  |  |  |  |  |  |  |  |  |  |  |  | 65,390 | 67,776 | 63,833
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 26,446 | 26,168 | 26,897
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 20,058 | 29,715 | 32,163
Interest expense (net) |  |  |  |  |  |  |  |  |  |  |  |  | (1,311) | 80 | 2,487
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 30,384 | 27,467 | 25,761
Goodwill | 86,880 |  |  |  | 89,458 |  |  |  | 88,976 |  |  |  | 86,880 | 89,458 | 88,976
Total assets | 348,455 |  |  |  | 333,381 |  |  |  | 335,163 |  |  |  | 348,455 | 333,381 | 335,163
Recycling [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside revenues |  |  |  |  |  |  |  |  |  |  |  |  | 39,131 | 47,934 | 43,557
Inter-company revenue |  |  |  |  |  |  |  |  |  |  |  |  | (84) | (248) | (402)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 4,188 | 4,016 | 3,573
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (456) | 5,375 | 4,116
Interest expense (net) |  |  |  |  |  |  |  |  |  |  |  |  | 5,553 | 6,794 | 4,550
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 915 | 5,485 | 1,764
Goodwill | 12,190 |  |  |  | 12,190 |  |  |  | 12,190 |  |  |  | 12,190 | 12,190 | 12,190
Total assets | 50,830 |  |  |  | 55,249 |  |  |  | 52,047 |  |  |  | 50,830 | 55,249 | 52,047
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside revenues |  |  |  |  |  |  |  |  |  |  |  |  | 42,096 | 44,726 | 44,927
Inter-company revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,328 | 2,714 | 2,788
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 1,532 | 2,238 | 2,570
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (3,677) | (3,993) | (2,873)
Interest expense (net) |  |  |  |  |  |  |  |  |  |  |  |  | 10,678 | 7,073 | 15,257
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 1,608 | 3,204 | 2,603
Total assets | 49,453 |  |  |  | 67,928 |  |  |  | 80,142 |  |  |  | 49,453 | 67,928 | 80,142
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-company revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ (100,372) | $ (105,858) | $ (104,457)

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