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Long-Term Debt (6.125% Senior Notes due 2021) - Additional Information (Detail) - 6.125% Senior Notes Due 2021 [Member] - USD ($) |  | 9 Months Ended
--- | --- | ---
Mar. 12, 2013 | Sep. 30, 2021
Debt Instrument [Line Items] |  |
Issued Senior Notes | $ 150,000,000.0 |
Debt instrument interest rate | 6.125% | 6.125%
Debt instrument maturity date | Mar. 15, 2021 |
Interest on the notes |  | payable semi-annually in arrears on March 15 and September 15 of each year
Debt instrument, redemption date |  | Jun. 24, 2020

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