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Quarterly Results - Additional Information (Detail) - USD ($) | 3 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
ASU 2016-09 |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Unfavorable after-tax reduction | $ 3,000,000.0 | $ 3,100,000 | $ 505,000 | $ 770,000 |  |  |
Tax reduction per diluted share | $ 0.04 | $ 0.04 | $ 0.01 | $ 0.01 |  |  |
Favorable after tax impact |  |  |  |  | $ 1,700,000 | $ 509,000 | $ 10,900,000
Favorable after tax impact per share diluted |  |  |  |  | $ 0.02 | $ 0.01 | $ 0.12
Unrealized Loss on Marketable Securities Held for Sale |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Unfavorable after-tax reduction |  | $ 2,100,000 |  | $ 7,400,000 |  |  |
Tax reduction per diluted share |  | $ 0.02 |  | $ 0.08 |  |  |
Unrealized Gain on Marketable Securities Held for Sale |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Unfavorable after-tax reduction | $ 3,900,000 |  | $ 2,200,000 |  |  |  |
Tax reduction per diluted share | $ 0.05 |  | $ 0.03 |  |  |  |
DOJ Reserve |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Unfavorable after-tax reduction |  |  |  |  | $ 6,200,000 | $ 8,400,000 |
Tax reduction per diluted share |  |  |  |  | $ 0.07 | $ 0.09 |
Unfavorable pre-tax reduction |  |  |  |  |  | $ 11,000,000.0 |
Provision For Asset Impairment |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Unfavorable after-tax reduction |  |  |  |  | $ 74,600,000 |  |
Tax reduction per diluted share |  |  |  |  | $ 0.84 |  |
Unfavorable pre-tax reduction |  |  |  |  | $ 97,600,000 |  |

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