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Debt - Summary of Principal Payments Required on Outstanding Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Debt Disclosure [Abstract]  
2015 $ 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 341,419us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Total $ 341,419us-gaap_LongTermDebt