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Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 338,382 $ 302,654
Accumulated Amortization (82,579) (64,961)
Net Balance 255,803 237,693
Customer relationships
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 311,438 277,356
Accumulated Amortization (64,368) (49,410)
Net Balance 247,070 227,946
Trademarks and tradenames
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 15,671 13,995
Accumulated Amortization (6,983) (4,383)
Net Balance 8,688 9,612
Purchased contracts
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,835 10,865
Accumulated Amortization (10,835) (10,865)
Covenant not to compete
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 438 438
Accumulated Amortization (393) (303)
Net Balance $ 45 $ 135