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Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 168,071 $ 52,419
Accumulated Amortization (39,447) (34,076)
Net Balance 128,624 18,343
Customer relationships
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 151,126 40,298
Accumulated Amortization (27,862) (23,392)
Net Balance 123,264 16,906
Purchased contracts
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,736 10,750
Accumulated Amortization (10,235) (10,023)
Net Balance 501 727
Trademarks and tradenames
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,769 1,291
Accumulated Amortization (1,225) (585)
Net Balance 4,544 706
Covenant not to compete
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 440 80
Accumulated Amortization (125) (76)
Net Balance $ 315 $ 4