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Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 302,654 $ 174,459
Accumulated Amortization (64,961) (46,559)
Net Balance 237,693 127,900
Customer relationships
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 277,356 157,364
Accumulated Amortization (49,410) (33,727)
Net Balance 227,946 123,637
Purchased contracts
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,865 10,823
Accumulated Amortization (10,865) (10,549)
Net Balance   274
Trademarks and tradenames
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 13,995 5,830
Accumulated Amortization (4,383) (2,096)
Net Balance 9,612 3,734
Covenant not to compete
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 438 442
Accumulated Amortization (303) (187)
Net Balance $ 135 $ 255