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v2.4.1.9

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013
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Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 40,357 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  | $ 34,217 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Book over tax depreciation of property and equipment | 31,535 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 28,868 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 19,881 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accrued expenses and reserves | 28,929 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 30,690 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 29,884 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Alternative minimum tax credit carryforwards | 3,457 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 3,330 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 3,330 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
General business tax credit carryforwards | 2,921 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness | 2,666 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness | 2,095 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Stock awards | 1,082 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,315 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,177 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Unrealized loss on hedges and swaps | 672 us-gaap_DeferredTaxAssetsDerivativeInstruments | 1,115 us-gaap_DeferredTaxAssetsDerivativeInstruments | 1,852 us-gaap_DeferredTaxAssetsDerivativeInstruments
Capital loss carryforwards |  | 2,510 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards |
Other | 2,106 us-gaap_DeferredTaxAssetsOther | 1,496 us-gaap_DeferredTaxAssetsOther | 964 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 111,059 us-gaap_DeferredTaxAssetsGross | 108,584 us-gaap_DeferredTaxAssetsGross | 93,400 us-gaap_DeferredTaxAssetsGross
Less: valuation allowance | (87,121)us-gaap_DeferredTaxAssetsValuationAllowance | (84,540)us-gaap_DeferredTaxAssetsValuationAllowance | (70,352)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets after valuation allowance | 23,938 us-gaap_DeferredTaxAssetsNet | 24,044 us-gaap_DeferredTaxAssetsNet | 23,048 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |  |
Amortization of intangibles | (28,659)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (28,210)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (25,973)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other | (264)us-gaap_DeferredTaxLiabilitiesOther | (286)us-gaap_DeferredTaxLiabilitiesOther | (143)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | (28,923)us-gaap_DeferredTaxLiabilities | (28,496)us-gaap_DeferredTaxLiabilities | (26,116)us-gaap_DeferredTaxLiabilities
Net deferred tax liability | $ (4,985)us-gaap_DeferredTaxAssetsLiabilitiesNet |  | $ (3,068)us-gaap_DeferredTaxAssetsLiabilitiesNet

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