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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
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 9,575 $ 10,490
Additions 0 0
Payments 0 0
Change in fair value 356 (159)
Ending balance $ 9,931 $ 10,331