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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
$ in Thousands
6 Months Ended
Sep. 30, 2015
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Level 3 liabilities, beginning balance $ 6,510
Additions 0
Payments 0
Change in fair value 307
Level 3 liabilities, ending balance $ 6,817