Change in Fair Value of Contingent Consideration as Determined by Level 3 Inputs (Detail) - Contingent Consideration - ECP Entwicklungsgesellschaft mbH - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Level 3 liabilities, beginning balance	$ 9,835	$ 7,749	$ 9,153	$ 7,563
Additions	0	0	0	0
Payments	0	0	0	0
Change in fair value	588	426	1,270	612
Level 3 liabilities, ending balance	$ 10,423	$ 8,175	$ 10,423	$ 8,175