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Goodwill and Other Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Components of goodwill and other intangible assets, net    
Goodwill $ 440,926 $ 440,709
Intangible assets:    
Total intangibles 174,994 178,343
Total goodwill and intangibles assets 615,920 619,052
Accumulated amortization:    
Total accumulated amortization (68,820) (67,833)
Goodwill and other intangible assets, net 547,100 551,219
Client lists [Member]
    
Intangible assets:    
Total intangibles 166,516 168,699
Accumulated amortization:    
Total accumulated amortization (63,957) (62,115)
Other intangible assets [Member]
    
Intangible assets:    
Total intangibles 8,478 9,644
Accumulated amortization:    
Total accumulated amortization $ (4,863) $ (5,718)