Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Goodwill and Other Intangible Assets - Change in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Beginning balance $ 220,097 $ 193,378
Goodwill acquired 39,890 26,719
Other 49  
Ending balance $ 259,938 $ 220,097