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Cash Equivalents, Marketable Securities and Fair Value Measurements - Additional Information (Detail) - ECP Entwicklungsgesellschaft mbH
$ in Millions
1 Months Ended
Jul. 31, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Payments to acquire businesses, cash paid $ 13.0
Potential payouts payments $ 15.0