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Goodwill and Intangible Assets - Goodwill / Tradename (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Goodwill And Tradename [Abstract]    
Beginning balance $ 19,548 $ 14,661
Acquisitions 8,242 4,806
Foreign currency adjustments (212) 81
Ending balance 27,578 19,548
Tradename, Beginning balance 3,526 3,218
Acquisitions, Tradename 2,865 300
Foreign currency adjustments, Tradename (43) 8
Tradename, Ending balance $ 6,348 $ 3,526