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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 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Level 3 liabilities, beginning balance $ 10,331 $ 9,418 $ 10,490 $ 9,153
Additions 0 0 0 0
Payments 0 0 0 0
Change in fair value 162 417 3 682
Level 3 liabilities, ending balance $ 10,493 $ 9,835 $ 10,493 $ 9,835