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Other Intangible Assets - Components of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Other intangible assets cost $ 32,900 $ 32,900
Less: Accumulated amortization (15,973) (14,860)
Total 16,927 18,040
Customer Relationships [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Other intangible assets cost 30,100 30,100
Less: Accumulated amortization (15,444) (14,378)
Total 14,656 15,722
Tradename [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Other intangible assets cost 2,800 2,800
Less: Accumulated amortization (529) (482)
Total $ 2,271 $ 2,318