Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Change in Carrying Amount of Goodwill (Detail)

v3.3.1.900
Goodwill and Other Intangible Assets - Change in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Beginning balance $ 193,378 $ 152,422
Goodwill acquired 26,719 40,341
Other   615
Ending balance $ 220,097 $ 193,378