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Goodwill and Intangible Assets - Goodwill / Tradename (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Tradename [Abstract]    
Goodwill, beginning balance $ 19,548 $ 14,661
Goodwill, acquisitions 113,671 4,806
Goodwill, foreign currency adjustments 332 81
Goodwill, ending balance 133,551 19,548
Tradename, beginning balance 3,526 3,218
Tradename, acquisitions 14,775 300
Tradename, foreign currency adjustments (93) 8
Tradename, ending balance $ 18,208 $ 3,526