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Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 250,274 $ 174,459
Accumulated Amortization (59,683) (46,559)
Net Balance 190,591 127,900
Customer relationships
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 230,112 157,364
Accumulated Amortization (44,875) (33,727)
Net Balance 185,237 123,637
Purchased contracts
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,826 10,823
Accumulated Amortization (10,826) (10,549)
Net Balance   274
Trademarks and tradenames
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 8,897 5,830
Accumulated Amortization (3,708) (2,096)
Net Balance 5,189 3,734
Covenant not to compete
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 439 442
Accumulated Amortization (274) (187)
Net Balance $ 165 $ 255