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Stock Repurchase Program - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 20, 2019 | Jan. 31, 2018 | Dec. 31, 2019 | Oct. 31, 2019 | Jun. 14, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  |  | $ 500,000,000.0 | $ 500,000,000.0
Remaining amount available for further repurchases |  |  |  | $ 400,000,000 |
Accelerated Share Repurchase Program September 2017 |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  | $ 20,000,000.0 |  |  |
Subsequent Event | Accelerated Share Repurchase Program December 2019 |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 100,000,000.0 |  |
Prepayment during period | $ 100,000,000.0 |  |  |  |
Initial share delivery, amount |  |  | $ 80,000,000.0 |  |
Prepayment during prior period, derivative settlement | $ 20,000,000.0 |  |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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