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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Jul. 31, 2014 | Jul. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |
Revenues | $ 141,387 | $ 128,558
Operating expenses: |  |
Cost of operations | 98,766 | 88,419
General and administration | 16,840 | 15,078
Depreciation and amortization | 16,368 | 15,197
Expense from divestiture, acquisition and financing costs |  | 20
Environmental remediation charge | 75 |
Severance and reorganization costs |  | 107
Total operating expenses | 132,049 | 118,821
Operating income (loss) | 9,338 | 9,737
Other expense (income), net: |  |
Interest income | (88) | (12)
Interest expense | 9,551 | 9,359
(Income) loss from equity method investments |  | 977
(Gain) loss on derivative instruments | (69) | (654)
Other income | (192) | (138)
Other expense, net | 9,202 | 9,532
Income (loss) from continuing operations before income taxes | 136 | 205
Provision (benefit) for income taxes | 290 | 319
Income (loss) from continuing operations | (154) | (114)
Discontinued operations: |  |
Income (loss) from discontinued operations, net |  | 329
Gain (loss) on disposal of discontinued operations, net |  | (378)
Net loss | (154) | (163)
Less: Net income (loss) attributable to noncontrolling interests | 136 | 28
Net income (loss) attributable to common stockholders | (290) | (191)
Parent [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Revenues |  |
Operating expenses: |  |
Cost of operations | 17 |
General and administration | 380 | 157
Depreciation and amortization | 195 | 214
Expense from divestiture, acquisition and financing costs |  |
Environmental remediation charge |  |
Severance and reorganization costs |  |
Total operating expenses | 592 | 371
Operating income (loss) | (592) | (371)
Other expense (income), net: |  |
Interest income |  | (1)
Interest expense | 9,589 | 9,347
(Income) loss from equity method investments | (10,089) | (9,172)
(Gain) loss on derivative instruments | (69) | (654)
Other income | (23) | (19)
Other expense, net | (592) | (499)
Income (loss) from continuing operations before income taxes |  | 128
Provision (benefit) for income taxes | 290 | 319
Income (loss) from continuing operations |  | (191)
Discontinued operations: |  |
Income (loss) from discontinued operations, net |  |
Gain (loss) on disposal of discontinued operations, net |  |
Net loss | (290) | (191)
Less: Net income (loss) attributable to noncontrolling interests |  |
Net income (loss) attributable to common stockholders | (290) | (191)
Guarantor [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Revenues | 141,090 | 127,693
Operating expenses: |  |
Cost of operations | 98,718 | 87,782
General and administration | 16,470 | 14,927
Depreciation and amortization | 16,173 | 14,802
Expense from divestiture, acquisition and financing costs |  | 20
Environmental remediation charge | 75 |
Severance and reorganization costs |  | 107
Total operating expenses | 131,436 | 117,638
Operating income (loss) | 9,654 | 10,055
Other expense (income), net: |  |
Interest income | (88) | (11)
Interest expense | (38) | 12
(Income) loss from equity method investments |  | (20)
(Gain) loss on derivative instruments |  |
Other income | (169) | (118)
Other expense, net | (295) | (137)
Income (loss) from continuing operations before income taxes | 9,949 | 10,192
Provision (benefit) for income taxes |  |
Income (loss) from continuing operations |  | 10,192
Discontinued operations: |  |
Income (loss) from discontinued operations, net |  | 329
Gain (loss) on disposal of discontinued operations, net |  | (378)
Net loss | 9,949 | 10,143
Less: Net income (loss) attributable to noncontrolling interests |  |
Net income (loss) attributable to common stockholders | 9,949 | 10,143
Non-Guarantor [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Revenues | 297 | 865
Operating expenses: |  |
Cost of operations | 31 | 637
General and administration | (10) | (6)
Depreciation and amortization |  | 181
Expense from divestiture, acquisition and financing costs |  |
Environmental remediation charge |  |
Severance and reorganization costs |  |
Total operating expenses | 21 | 812
Operating income (loss) | 276 | 53
Other expense (income), net: |  |
Interest income |  |
Interest expense |  |
(Income) loss from equity method investments |  | 997
(Gain) loss on derivative instruments |  |
Other income |  | (1)
Other expense, net |  | 996
Income (loss) from continuing operations before income taxes | 276 | (943)
Provision (benefit) for income taxes |  |
Income (loss) from continuing operations |  | (943)
Discontinued operations: |  |
Income (loss) from discontinued operations, net |  |
Gain (loss) on disposal of discontinued operations, net |  |
Net loss | 276 | (943)
Less: Net income (loss) attributable to noncontrolling interests | 136 | 28
Net income (loss) attributable to common stockholders | 140 | (971)
Elimination [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Revenues |  |
Operating expenses: |  |
Cost of operations |  |
General and administration |  |
Depreciation and amortization |  |
Expense from divestiture, acquisition and financing costs |  |
Environmental remediation charge |  |
Severance and reorganization costs |  |
Total operating expenses |  |
Operating income (loss) |  |
Other expense (income), net: |  |
Interest income |  |
Interest expense |  |
(Income) loss from equity method investments | 10,089 | 9,172
(Gain) loss on derivative instruments |  |
Other income |  |
Other expense, net | 10,089 | 9,172
Income (loss) from continuing operations before income taxes | (10,089) | (9,172)
Provision (benefit) for income taxes |  |
Income (loss) from continuing operations |  | (9,172)
Discontinued operations: |  |
Income (loss) from discontinued operations, net |  |
Gain (loss) on disposal of discontinued operations, net |  |
Net loss | (10,089) | (9,172)
Less: Net income (loss) attributable to noncontrolling interests |  |
Net income (loss) attributable to common stockholders | $ (10,089) | $ (9,172)

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