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Long-Term Debt - Senior Notes - Additional Information (Detail) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 15, 2019 | Jan. 19, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest expense related to amortization of debt issuance costs |  |  | $ 0.3 | $ 0.2 | $ 0.5 | $ 0.5 |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of borrowings |  | $ 239.0 |  |  |  |  |
3.95% Senior Notes Due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  | 525.0 |  |  |  |  |
Proceeds from borrowings, before offering expenses |  | $ 521.0 |  |  |  |  |
Debt payment term |  |  |  |  | We pay interest on the 2028 Notes on February 1 and August 1 of each year. |  |
Debt maturity date |  | Feb. 01, 2028 |  |  |  |  |
Debt interest rate |  | 3.95% | 3.95% |  | 3.95% |  | 3.95%
Debt instrument redemption description |  |  |  |  | At our option, we may redeem the Senior Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, in the case of the 2028 Notes, and on August 15, 2029, in the case of the 2029 Notes, at our option, we may redeem the respective Senior Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date. |  |
Debt instrument, redemption percentage |  | 100.00% |  |  |  |  |
Debt instrument redemption upon the occurrence of change of control, description |  |  |  |  | Upon the occurrence of a change of control triggering event, as defined in the indentures, each holder of the Senior Notes may require us to purchase all or a portion of such holder’s Senior Notes at a price equal to 101% of their principal amount, plus accrued and unpaid interest, if any, to, but excluding, the repurchase date. |  |
Redemption price percentage of principal amount of debt instrument on change of control |  | 101.00% |  |  |  |  |
5.15% Senior Notes Due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, aggregate principal amount | $ 350.0 |  |  |  |  |  |
Proceeds from borrowings, before offering expenses | $ 347.0 |  |  |  |  |  |
Debt payment term |  |  |  |  | We pay interest on the 2029 Notes on May 15 and November 15 of each year. |  |
Debt maturity date | Nov. 15, 2029 |  |  |  |  |  |
Debt interest rate | 5.15% |  | 5.15% |  | 5.15% |  | 5.15%
Debt instrument redemption description |  |  |  |  | At our option, we may redeem the Senior Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, in the case of the 2028 Notes, and on August 15, 2029, in the case of the 2029 Notes, at our option, we may redeem the respective Senior Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date. |  |
Debt instrument, redemption percentage | 100.00% |  |  |  |  |  |
Term Loan Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of borrowings | $ 50.0 |  |  |  |  |  |
2028 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  |  | $ 15.5
2029 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, repurchase amount |  |  |  |  |  |  | $ 0.8

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