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Capital Stock - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Oct. 31, 2019
Class Of Stock Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Authorized capital stock | 485,000,000.0 |  |  | 485,000,000.0 |  |  |  |  |  |  |  |
Common stock, shares authorized | 475,000,000 |  |  | 475,000,000 |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 10,000,000 |  |  | 10,000,000 |  |  |  |  |  |  |  |
Common dividends declared per share | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
New stock purchase program, approved amount |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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