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Long-Term Debt and Capital Leases - Schedule of Future Maturities of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]      
2015 $ 1,656us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths    
2016 131,704us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo    
2017 237us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree    
2018 226us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour    
2019 323,925us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive    
Thereafter 77,963us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive    
Total $ 535,711us-gaap_DebtAndCapitalLeaseObligations $ 508,019us-gaap_DebtAndCapitalLeaseObligations $ 496,205us-gaap_DebtAndCapitalLeaseObligations