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Intangible Assets by Major Class (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Goodwill And Other Intangible Assets [Line Items]    
Intangible assets, Gross Carrying Amount $ 208,477 $ 214,166
Finite lived intangible assets, Gross Carrying Amount 202,877 208,566
Intangible assets, Accumulated Amortization 119,606 117,018
Indefinite Lived Trade Names
    
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
Customer Relationships
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 153,856 157,064
Intangible assets, Accumulated Amortization 75,975 73,977
Non-Competition Agreements
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 10,994 10,922
Intangible assets, Accumulated Amortization 9,369 9,051
Software
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 37,542 40,095
Intangible assets, Accumulated Amortization 33,822 33,625
Tradenames
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 485 485
Intangible assets, Accumulated Amortization $ 440 $ 365
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 3 years  
Minimum | Tradenames
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
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 10 years  
Maximum | Tradenames
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 2 years