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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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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 |

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