Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Goodwill and Other Intangible Assets - Change in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]    
Beginning balance $ 152,422us-gaap_Goodwill $ 134,025us-gaap_Goodwill
Goodwill acquired 40,341us-gaap_GoodwillAcquiredDuringPeriod 18,211us-gaap_GoodwillAcquiredDuringPeriod
Other 615us-gaap_GoodwillOtherChanges 186us-gaap_GoodwillOtherChanges
Ending balance $ 193,378us-gaap_Goodwill $ 152,422us-gaap_Goodwill