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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Commitments and Contingencies [Line Items]    
Provision for transition tax   $ 37.2
Transition tax paid   $ 8.3
Transition tax $ 28.9  
Other Long-term Liabilities    
Commitments and Contingencies [Line Items]    
Transition tax 28.0  
Accounts Payable, Accrued Expenses and Operating Lease Liabilities    
Commitments and Contingencies [Line Items]    
Transition tax $ 0.9