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Intangible Assets By Major Class (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount $ 195,501 $ 192,846
Finite lived intangible assets, Accumulated Amortization 97,033 79,557
Intangible assets, Gross Carrying Amount 201,101 198,446
Intangible assets, Accumulated Amortization 97,033 79,557
Customer Relationships
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 146,872 144,696
Finite lived intangible assets, Accumulated Amortization 60,494 49,381
Non-Competition Agreements
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 14,470 14,601
Finite lived intangible assets, Accumulated Amortization 10,619 8,965
Software
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 33,979 33,549
Finite lived intangible assets, Accumulated Amortization 25,867 21,211
Tradenames
    
Goodwill And Other Intangible Assets [Line Items]    
Indefinite-lived intangible assets, Useful Life Indefinite  
Indefinite-lived intangible assets, Gross Carrying Amount 5,600 5,600
Finite lived intangible assets, Gross Carrying Amount 180  
Finite lived intangible assets, Accumulated Amortization $ 53  
Minimum | Customer Relationships
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
Minimum | Non-Competition Agreements
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
Minimum | Software
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 2 years  
Maximum | Customer Relationships
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 15 years  
Maximum | Non-Competition Agreements
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 10 years  
Maximum | Software
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 6 years  
Maximum | Tradenames
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 2 years