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Debt - Summary of Outstanding Debt (Detail) - USD ($)		Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Foreign subsidiary lines of credit			$ 366,000
Total notes payable and debt, current		$ 150,000,000	100,366,000
Unamortized debt issuance costs		(3,485,000)	(4,203,000)
Total long-term debt		1,206,515,000	1,580,797,000
Total debt		1,356,515,000	1,681,163,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term debt		400,000,000	625,000,000
Senior Unsecured Notes Series B [Member]
Debt Instrument [Line Items]
Long-term debt			100,000,000
Senior Unsecured Notes Series E [Member]
Debt Instrument [Line Items]
Total notes payable and debt, current		50,000
Long-term debt			50,000,000
Senior Unsecured Notes Series F [Member]
Debt Instrument [Line Items]
Total notes payable and debt, current		100,000
Senior Unsecured Notes Series G [Member]
Debt Instrument [Line Items]
Long-term debt		50,000,000	50,000,000
Senior Unsecured Notes Series H [Member]
Debt Instrument [Line Items]
Long-term debt	[1]	50,000,000	50,000,000
Senior Unsecured Notes Series I [Member]
Debt Instrument [Line Items]
Long-term debt		50,000,000	50,000,000
Senior Unsecured Notes Series K [Member]
Debt Instrument [Line Items]
Long-term debt		160,000,000	160,000,000
Senior Unsecured Notes Series L [Member]
Debt Instrument [Line Items]
Long-term debt		200,000,000	200,000,000
Senior Unsecured Notes Series M [Member]
Debt Instrument [Line Items]
Long-term debt		$ 300,000,000	$ 300,000,000
[1] Series H senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.25%.

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Amount of short-term and long-term debt and lease obligation.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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