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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
Deferred tax assets:      
Net operating loss carryforwards $ 40,357us-gaap_DeferredTaxAssetsOperatingLossCarryforwards   $ 34,217us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Book over tax depreciation of property and equipment 31,535us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 28,868us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 19,881us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accrued expenses and reserves 28,929us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 30,690us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 29,884us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Alternative minimum tax credit carryforwards 3,457us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 3,330us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 3,330us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
General business tax credit carryforwards 2,921us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 2,666us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 2,095us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Stock awards 1,082us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,315us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,177us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Unrealized loss on hedges and swaps 672us-gaap_DeferredTaxAssetsDerivativeInstruments 1,115us-gaap_DeferredTaxAssetsDerivativeInstruments 1,852us-gaap_DeferredTaxAssetsDerivativeInstruments
Capital loss carryforwards   2,510us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
Other 2,106us-gaap_DeferredTaxAssetsOther 1,496us-gaap_DeferredTaxAssetsOther 964us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 111,059us-gaap_DeferredTaxAssetsGross 108,584us-gaap_DeferredTaxAssetsGross 93,400us-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 23,938us-gaap_DeferredTaxAssetsNet 24,044us-gaap_DeferredTaxAssetsNet 23,048us-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