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Components of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount $ 49,251 $ 32,869
Accumulated Amortization 10,968 7,827
Customer Relationships
    
Schedule Of Goodwill And Intangible Assets [Line Items]    
Weighted Average Remaining Life 16 years 8 months 12 days  
Gross Carrying Amount 48,261 32,520
Accumulated Amortization 10,663 7,771
Other Intangible Assets
    
Schedule Of Goodwill And Intangible Assets [Line Items]    
Weighted Average Remaining Life 2 years 10 months 24 days  
Gross Carrying Amount 990 349
Accumulated Amortization $ 305 $ 56