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Stockholders' Equity (Deficit) - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 12 Months Ended
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Sep. 16, 2019 USD ($) | Sep. 16, 2019 $ / shares | Jun. 19, 2019 USD ($) | Jun. 19, 2019 $ / shares | Oct. 05, 2018 USD ($) | Oct. 05, 2018 $ / shares | Apr. 25, 2018 USD ($) | Apr. 25, 2018 $ / shares | Mar. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,513 | 176,989 | 19,120
Net cost for common stock purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,533,000 | $ 66,986,000 | $ 159,544,000
Dividend paid (per share) | $ / shares |  |  |  |  |  |  |  |  | $ 1.00 | $ 1.00 | $ 1.00 | $ 1.00 | $ 0.75 | $ 0.75 | $ 0.75 | $ 0.75 | $ 0.50 |  | $ 3.75 | $ 2.75
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,949,000 | $ 568,787,000 | $ 571,451,000
Decrease from distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,238,000 | $ 7,745,000 | $ 305,372,000
WML |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of dividend | $ 215,100,000 |  | $ 215,000,000.0 |  | $ 358,300,000 |  | $ 358,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease from distributions to noncontrolling interest | 82,900,000 |  | 83,000,000.0 |  | 138,300,000 |  | 138,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries | WML |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid (per share) | $ / shares |  | $ 0.45 |  | $ 0.45 |  | $ 0.75 |  | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends | $ 298,000,000.0 |  | $ 298,000,000.0 |  | $ 496,600,000 |  | $ 497,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Wynn Palace and Wynn Macau |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.00% |  |
Equity Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount under repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |
Stock repurchases, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 413,439 | 1,478,552
Net cost for common stock purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,200,000 | $ 156,700,000
Repurchase authority remaining under the program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,100,000 |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared, recorded as reduction of retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 107,500,000 | 403,000,000.0 | 294,900,000
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,993,000 | 402,952,000 | 294,923,000
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44,000) | 165,835,000 | 276,528,000
Decrease from distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,238,000 | $ 7,700,000 | $ 305,372,000

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