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Intangible Assets by Major Class (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill And Other Intangible Assets [Line Items]    
Intangible assets, Gross Carrying Amount $ 214,166 $ 206,933
Finite lived intangible assets, Gross Carrying Amount 208,566 201,333
Intangible assets, Accumulated Amortization 117,018 102,752
Minimum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
Maximum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 15 years  
Customer Relationships
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 157,064 151,990
Intangible assets, Accumulated Amortization 73,977 64,095
Customer Relationships | Minimum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
Customer Relationships | Maximum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 15 years  
Non-Competition Agreements
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 10,922 15,184
Intangible assets, Accumulated Amortization 9,051 11,158
Non-Competition Agreements | Minimum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
Non-Competition Agreements | Maximum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 10 years  
Software
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 40,095 33,979
Intangible assets, Accumulated Amortization 33,625 27,424
Software | Minimum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 3 years  
Software | Maximum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 10 years  
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 485 180
Intangible assets, Accumulated Amortization $ 365 $ 75
Tradenames | Minimum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 1 year  
Tradenames | Maximum
    
Goodwill And Other Intangible Assets [Line Items]    
Finite lived intangible assets, Useful Life in Years 2 years