Components of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income (loss) before income taxes									$ 78,172	$ 54,406	$ 22,243
Income (loss) before income taxes, foreign									13,170	11,432	6,522
Income (loss) before income taxes									91,342	65,838	28,765
Current income tax provision, Federal									7,313	1,690	464
Current income tax provision, State									5,045	2,113	424
Current income tax provision, Foreign									1,066	1,592	1,283
Current income tax provision									13,424	5,395	2,171
Deferred income tax provision, Federal									23,008	18,769	(66,140)
Deferred income tax provision, State									(349)	1,284	(13,430)
Deferred income tax provision, Foreign									3,144	2,243	(7,524)
Deferred income tax provision									25,803	22,296	(87,094)
Total income tax provision (benefit)	$ 14,457	$ 10,394	$ 5,861	$ 8,515	$ 9,229	$ 6,943	$ 5,231	$ 6,288	$ 39,227	$ 27,691	$ (84,923)