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Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 30, 2015
Subsequent Event [Line Items]    
Proceeds from bank borrowings $ 50,000us-gaap_ProceedsFromBankDebt  
Subsequent Event    
Subsequent Event [Line Items]    
Proceeds from bank borrowings   20,000us-gaap_ProceedsFromBankDebt
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Line of credit facility, amount outstanding   $ 95,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember