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Valuation and Qualifying Accounts (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]    
Accounts receivable, less allowance for doubtful accounts $ 2,491us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,912us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowance for Doubtful Accounts    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Accounts receivable, less allowance for doubtful accounts   $ 1,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember