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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Goodwill [Roll Forward]  
Beginning balance $ 143,955
Goodwill acquired during the period 125
Goodwill allocated to specific assets for business acquired in first six months of 2013 (1,680)
Goodwill adjustments for purchase price allocation of businesses acquired 117
Ending balance $ 142,517