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Long-Term Debt - Summary of Contractual Maturities of Debt Over Next Five Years (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Equity Method Investments And Cost Method Investments [Abstract]  
2015 $ 16,500us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 22,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 22,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 22,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 $ 22,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive