Goodwill and Other Intangible Assets - Estimated Amortization Expense in Future Years (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
2016	$ 42,185
2017	30,733
2018	23,462
2019	18,026
2020	13,323
Later years	12,539
Future Amortization Expense, Total	$ 140,268	$ 35,027