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Earnings Per Share - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 100,000
Shares repurchased |  | 1.2 |  |  |
Shares repurchased at cost |  | $ 14,100 | $ 14,069 |  |
Performance Restricted Stock Units [Member] |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Mark-to-market adjustment | $ 1,400 |  |  | $ 2,800 |

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