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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Balance at beginning of period $ 240,314 $ 107,651
Effect of foreign currency exchange rates 1,178 1,327
Goodwill acquired through acquisitions 128,574 131,336
Balance at end of period 370,066 240,314
United States [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 168,202 61,312
Goodwill acquired through acquisitions 96,533 106,890
Balance at end of period 264,735 168,202
Europe [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 40,276 34,489
Effect of foreign currency exchange rates 2,145 697
Goodwill acquired through acquisitions 28,734 5,090
Balance at end of period 71,155 40,276
Asia Pacific [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 31,836 11,850
Effect of foreign currency exchange rates (967) 630
Goodwill acquired through acquisitions 3,307 19,356
Balance at end of period $ 34,176 $ 31,836