Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Current:
Federal		$ 9,185,000	$ 6,377,000	$ 115,315,000
State		2,561,000	5,027,000	3,461,000
Foreign		14,561,000	16,636,000	20,030,000
Total current income tax expense		26,307,000	28,040,000	138,806,000
Deferred income tax (benefit) expense
Federal		5,489,000	(5,031,000)	(9,551,000)
State		741,000	(669,000)	789,000
Foreign		(22,716,000)	(756,000)	(11,551,000)
Total deferred income tax (benefit) expense		(16,486,000)	(6,456,000)	(20,313,000)
Income tax expense	$ 21,000	$ 9,821,000	$ 21,584,000	$ 118,493,000