Equity Method Investments and Related-Party Transactions - Schedule of Related Party Transactions (Detail) - Euro Infrastructure Co [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Related Party Transaction [Line Items]
Revenue		$ 1,620	$ 8,469	$ 4,798
Expense	$ 1,815	5,664	10,720	10,254
Cash received	6,253	4,048	8,605	10,102
Cash paid	3,198	$ 6,585	10,654	$ 10,677
Collections in excess of revenues and deferred revenues	$ 3,113		$ 3,113		$ 4,703