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Capital Stock - Capital Stock (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021
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 | 101,429,683
Continuous Offering Program [Member] |  |
Class of Stock [Line Items] |  |
Sale of Stock, Offering Amount | $ 65.0 |
Common Stock, Shares, Issued |  | 0

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