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Shareholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2014 | Dec. 31, 2018 | May 08, 2018
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  | $ 150,000,000.0 | $ 300,000,000.0 |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.18 | $ 0.18 | $ 0.175 | $ 0.35 |  |  |  |  |
Dividends payable | $ 30,200,000 |  |  |  | 30,200,000 |  |  | $ 30,800,000 |
May 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of shares of our common stock up to a maximum aggregate value |  |  |  |  |  |  |  |  | $ 750,000,000.0
Common stock authorized for repurchase, expiration date |  |  |  |  |  |  | May 31, 2021 |  |
December 2014 Share Repurchase Program |  |  |  |  |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Share repurchase program remaining available amount | $ 250,000,000.0 |  |  |  | $ 250,000,000.0 |  |  |  |

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