Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 530,488	$ 537,037
U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	498,515	461,283
Non U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 31,973	$ 75,754