Goodwill and Other Intangible Assets Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 427,790		$ 421,563
Total other intangible assets, net	359,145		$ 371,416
Amortization expense of intangible assets	6,238	$ 3,774
Estimated Future Amortization Expense by Fiscal Year [Abstract]
Remainder of 2016	14,000
2017	25,900
2018	24,400
2019	19,500
2020	17,100
2021	15,900
After 2021	$ 12,300