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Earnings Per Share - Calculation of Fully Diluted Earnings Per Share from Discontinued Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fully diluted earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations available to common stockholders |  |  |  |  |  |  |  |  |  |  | $ 121,963
Weighted-average shares: |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding | 365,259 | 363,244 | 360,614 | 358,001 | 351,431 | 346,060 | 341,272 | 338,403 | 361,736 | 344,332 | 322,141
Fully diluted weighted-average shares of common stock outstanding | 365,259 | 549,244 | 546,123 | 538,442 | 351,431 | 346,060 | 522,984 | 516,066 |  | 459,743 |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Fully diluted earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations available to common stockholders |  |  |  |  |  |  |  |  |  |  | $ 121,963
Net income (loss) for fully diluted shares |  |  |  |  |  |  |  |  |  |  | $ 121,963
Weighted-average shares: |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding |  |  |  |  |  |  |  |  |  |  | 322,141
RSUs (Treasury stock method) |  |  |  |  |  |  |  |  |  |  | 368
Other |  |  |  |  |  |  |  |  |  |  | 1,335
Fully diluted weighted-average shares of common stock outstanding |  |  |  |  |  |  |  |  |  |  | 323,844
Fully diluted earnings (loss) per share from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ 0.38

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- Definition Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 5.E) -URI http://asc.fasb.org/extlink&oid=120398118&loc=d3e355146-122828 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256 + Details
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