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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Goodwill [Roll Forward]  
Beginning balance $ 100,188
Goodwill acquired during the period 14,400
Goodwill allocated to specific assets for business acquired in 2012 (2,340)
Ending balance $ 112,248