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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 26,900 $ 26,900
Accumulated Amortization (13,239) (9,246)
Net Carrying Amount 13,661 17,654
Non-compete Agreement
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,400 1,400
Accumulated Amortization (1,400) (1,050)
Net Carrying Amount   350
Customer Relationships
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 25,500 25,500
Accumulated Amortization (11,839) (8,196)
Net Carrying Amount $ 13,661 $ 17,304