Debt - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 17, 2020	Sep. 09, 2020	May 04, 2020
Debt Instrument [Line Items]
Expiration date	Jul. 17, 2024
Repurchase Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum loan borrowing capacity	$ 150,000,000
Debt outstanding	$ 0	$ 0
Senior notes interest rate	7.05%
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 effective interest rate	3.02%
Senior notes proceeds	$ 595,200,000
Senior notes maturity date	May 15, 2030
Frequency of senior notes payment	semi-annually in arrears on May 15 and November 15
Debt Instrument, Unamortized Discount (Premium), Net	$ 764,000	871,000
Debt issuance cost	$ 2,303,000	2,664,000
Senior notes interest rate	3.00%
$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 Instrument, Unamortized Discount (Premium), Net	(17,040,000)	(19,518,000)
Debt issuance cost	947,000	$ 1,095,000
Amended Credit Agreement [Member] | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum loan borrowing capacity	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]
Debt outstanding	$ 0
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
Credit Agreement | Revolving Credit Facility | Sublimit for Issuance of Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	$ 13,000,000