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Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 17, 2020 | Sep. 09, 2020 | May 04, 2020
Debt Instrument [Line Items] |  |  |  |  |
Expiration date | Jul. 19, 2023 |  |  |  |
Senior Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes principal amount | $ 600,000,000 |  |  |  |
Senior notes interest rate | 3.95% |  |  |  |
Repurchase Agreement | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes interest rate | 6.06% |  |  |  |
Maximum loan borrowing capacity | $ 150,000,000 |  |  |  |
Debt outstanding | 0 | $ 0 |  |  |
Debt outstanding | $ 0 | 0 |  |  |
Repurchase Agreement | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, marginal interest rate | 1.70% |  |  |  |
Repurchase Agreement | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, marginal interest rate | 1.70% |  |  |  |
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 | $ 2,664,000 | 3,025,000 |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | $ (871,000) | (975,000) |  |  |
$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 | 1,095,000 | 1,243,000 |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | 19,518,000 | $ 21,945,000 |  |  |
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 Amended Credit Agreement generally bear interest for Base Rate Loans at a Base Rate equal to the highest of (a) the Federal Funds Rate plus one-half of one percent, (b) Bank of America’s publicly announced “prime rate,” (c) one percent or (d) Term SOFR plus 100 basis points. |  |  |  |
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 | $ 11,000,000 |  |  |  |

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