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Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 174,459 $ 52,419
Accumulated Amortization (46,559) (34,076)
Net Balance 127,900 18,343
Customer relationships
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 157,364 40,298
Accumulated Amortization (33,727) (23,392)
Net Balance 123,637 16,906
Purchased contracts
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,823 10,750
Accumulated Amortization (10,549) (10,023)
Net Balance 274 727
Trademarks and tradenames
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,830 1,291
Accumulated Amortization (2,096) (585)
Net Balance 3,734 706
Covenant not to compete
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 442 80
Accumulated Amortization (187) (76)
Net Balance $ 255 $ 4