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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - Customer Relationships - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Acquired Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 25,500 $ 25,500
Accumulated Amortization (18,214) (15,482)
Net Carrying Amount $ 7,286 $ 10,018