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Capital Stock - Capital Stock (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Preferred stock, share authorized (in shares) |  | 25,000,000 | 25,000,000
Preferred stock, par value (in usd per share) |  | $ 1 | $ 1
Common stock, share authorized (in shares) |  | 725,000,000 | 725,000,000
Common Stock, Par or Stated Value Per Share |  | $ 0.001 | $ 0.001
Preferred stock, share issued (in shares) |  | 0 |
Common Stock, Shares, Issued |  | 101,108,886 | 100,784,422
Continuous Offering Program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Sale of Stock, Offering Amount | $ 63.0 |  |
Common Stock, Shares, Issued |  | 0 |

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