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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Level 3 liabilities, beginning balance $ 9,418 $ 7,739 $ 9,153 $ 7,563
Additions 0 0 0 0
Payments 0 0 0 0
Change in fair value 417 10 682 186
Level 3 liabilities, ending balance $ 9,835 $ 7,749 $ 9,835 $ 7,749