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Common Stock and Treasury Stock - Additional Information (Details) - USD ($) | 3 Months Ended | 184 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Feb. 28, 2018
Equity [Abstract] |  |  |  |
Amount approved for repurchase |  |  |  | $ 200,000,000.0
Shares repurchased (in shares) | 1,000,000 | 23,802 | 46,357,495 |
Shares repurchased, value | $ 28,881,000 | $ 631,000 | $ 612,300,000 |
Maximum remaining amount authorized for purchase | $ 112,100,000 |  | $ 112,100,000 |

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