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Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Feb. 12, 2021 | Dec. 31, 2020 | Sep. 17, 2020 | Sep. 09, 2020 | May 04, 2020 | Sep. 10, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |
Expiration date | Jul. 20, 2022 |  |  |  |  |  |
Senior Notes due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes principal amount |  |  |  |  |  |  | $ 600,000,000
Senior notes maturity date | Sep. 15, 2022 |  |  |  |  |  |
Senior notes effective interest rate |  |  |  |  |  |  | 3.97%
Senior notes proceeds | $ 593,900,000 |  |  |  |  |  |
Senior notes interest rate | 3.95% |  |  |  |  |  |
Frequency of senior notes payment | semi-annually in arrears on March 15 and September 15 |  |  |  |  |  |
Debt issuance cost | $ 359,000 |  | $ 868,000 |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | $ (87,000) |  | (207,000) |  |  |  |
Repurchase Agreement | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes interest rate | 1.88% |  |  |  |  |  |
Maximum loan borrowing capacity | $ 150,000,000 |  |  |  |  |  |
Borrowing base limitations | 0 |  |  |  |  |  |
Debt outstanding | 0 |  |  |  |  |  |
Debt outstanding | $ 0 |  |  |  |  |  |
Repurchase Agreement | Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes interest rate | 1.75% |  |  |  |  |  |
Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes principal amount |  |  |  |  |  | $ 600,000,000 |
Senior notes maturity date | May 15, 2030 |  |  |  |  |  |
Senior notes effective interest rate | 3.02% |  |  |  |  |  |
Senior notes proceeds | $ 595,200,000 |  |  |  |  |  |
Senior notes interest rate | 3.00% |  |  |  |  |  |
Frequency of senior notes payment | semi-annually in arrears on May 15 and November 15 |  |  |  |  |  |
Debt issuance cost | $ 3,025,000 |  | 3,387,000 |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | $ (975,000) |  | (1,075,000) |  |  |  |
$250M Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes principal amount |  |  |  |  | $ 250,000,000 |  |
$50M Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes principal amount |  |  |  | $ 50,000,000 |  |  |
$300M Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes effective interest rate | 2.00% |  |  |  |  |  |
Senior notes proceeds | $ 323,600,000 |  |  |  |  |  |
Debt issuance cost | 1,243,000 |  | 1,392,000 |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | 21,945,000 |  | $ 24,324,000 |  |  |  |
Amended Credit Agreement [Member] | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum loan borrowing capacity |  | $ 300,000,000 |  |  |  |  |
Increase in commitment available | 300,000,000 |  |  |  |  |  |
Amended Credit Agreement [Member] | Revolving Credit Facility | Sublimit for Issuance of Letters of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum loan borrowing capacity | $ 100,000,000 |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, interest rate description | Borrowings under the Credit Agreement generally bear interest for Base Rate Loans at a Base Rate equal to the highest of (i) a Federal Funds Rate plus one-half of one percent, (ii) Bank of America’s publicly announced “prime rate,” and (iii) the Eurodollar Rate plus one percent, plus the Applicable Rate which is based on our debt rating, or for Eurodollar Rate Loans, at the Eurodollar Rate equal to LIBOR plus the Applicable Rate. |  |  |  |  |  |
Expiration date | Feb. 12, 2026 |  |  |  |  |  |
Debt outstanding | $ 0 |  |  |  |  |  |
Debt outstanding | 0 |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility | Sublimit for Issuance of Letters of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding | $ 16,100,000 |  |  |  |  |  |

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