Long-Term Debt - Additional Information (Detail)	Jun. 29, 2023 USD ($)	Jan. 05, 2023 USD ($)	May 24, 2021 USD ($)	Jan. 04, 2019	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Jul. 01, 2021 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 900,000,000
Line of credit facility, accordion feature					$ 400,000,000
Amounts due within one year					26,391,000		$ 26,522,000
Minimum fixed charges coverage ratio (not less than)				1.50
Maximum consolidated leverage ratio (not to exceed)				3.50
Consolidated leverage ratio (not more than)				4.00
Maturity obligation, year one					26,400,000
Maturity obligation, year two					195,100,000
Maturity obligation, year three					32,600,000
Maturity obligation, year four					32,600,000
Maturity obligation, year five					7,600,000
Maturity obligation, thereafter					215,300,000
Proceeds from lines of credit					9,500,000
Restricted cash balances					500,000		2,000,000.0
Long-term Debt					508,013,000		601,692,000
Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from lines of credit					$ 1,500,000
Series C Senior Notes Due July 2036
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage					2.69%	2.69%
Series A Senior Notes Due 2036
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage					2.69%	2.69%
Senior Notes | Series C Senior Notes Due July 2036
Debt Instrument [Line Items]
Aggregate principal amount								$ 100,000,000
Debt instrument, stated interest rate percentage								2.69%
Senior Notes | Series A Senior Notes Due 2036
Debt Instrument [Line Items]
Aggregate principal amount								$ 100,000,000
Debt instrument, stated interest rate percentage								2.69%
Senior Notes | NYL Note Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 200,000,000
Senior Notes | Senior Notes Due 2028
Debt Instrument [Line Items]
Aggregate principal amount	$ 50,000,000
Debt instrument, stated interest rate percentage	5.25%				5.25%	5.25%
Debt Instrument, Principal Amount Due In Year Before Maturity	$ 25,000,000
Debt Instrument, Principal Amount Due At Maturity	$ 25,000,000
Long-term Debt					$ 49,953,000		49,939,000
Unsecured Debt | Series C Senior Notes Due July 2036
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 335,000,000
Notes Payable | Multi-currency Notes Due in 2031
Debt Instrument [Line Items]
Aggregate principal amount					$ 53,500,000	£ 42,700,000
Debt instrument, stated interest rate percentage					3.40%	3.40%
Amounts due within one year					$ 7,600,000	£ 6,100,000
Line of Credit | Term Loan Facility 2023 | Secured Debt
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage					5.56%	5.56%
Long-term Debt		$ 250,000,000			$ 205,152,000		$ 230,604,000
Base Rate | Senior Revolving Credit Facility Maturing in 2026
Debt Instrument [Line Items]
Interest rate margin, percentage			0.00%
Overnight Bank Funding Rate | Senior Revolving Credit Facility Maturing in 2026
Debt Instrument [Line Items]
Interest rate margin, percentage			0.50%
Secured Overnight Financing Rate (SOFR) | Senior Revolving Credit Facility Maturing in 2026
Debt Instrument [Line Items]
Interest rate margin, percentage			1.00%
Minimum | Senior Revolving Credit Facility Maturing in 2026
Debt Instrument [Line Items]
Interest rate margin, percentage			0.00%
Minimum | Line of Credit | Term Loan Facility 2023 | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Basis Spread On EBITDA Leverage Ratio And Elected Rate		0.00%
Maximum | Senior Revolving Credit Facility Maturing in 2026
Debt Instrument [Line Items]
Interest rate margin, percentage			1.75%
Maximum | Line of Credit | Term Loan Facility 2023 | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Basis Spread On EBITDA Leverage Ratio And Elected Rate		20000.00%