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Fair Value Measurements - Additional Information (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Fair Value, Inputs, Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets, fair value disclosure, recurring $ 2.3
Fair Value, Inputs, Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets, fair value disclosure, recurring $ 11.3