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Long-Term Debt (Redemption of 6.125% Senior Notes and 5.125% Senior Notes) - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 10, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Jul. 01, 2014 | Mar. 12, 2013
6.125% Senior Notes Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate |  | 6.125% |  |  | 6.125%
Debt instrument, redemption date |  | Jun. 24, 2020 |  |  |
Debt instrument, redemption price percentage of principal amount | 100.00% |  |  |  |
5.125% Senior Notes Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate |  | 5.125% |  | 5.125% |
Debt instrument, redemption date |  | Jun. 24, 2020 |  |  |
Debt instrument, redemption price percentage of principal amount | 100.00% |  |  |  |
6.125% Senior Notes Due 2021 and 5.125% Senior Notes Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt extinguishment charge |  |  | $ 3.3 |  |

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