Employee Benefit Plans - Schedule of Categorization of Plans' Assets (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		$ 782,463	$ 799,895
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		290,595	355,950
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		144,704	91,634
NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	[1]	347,164	352,311
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		11,036	19,489
Cash [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		11,036	19,489
Debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		84,005	84,031
Debt [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		84,005	84,031
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		43,174	41,251
Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		43,174	41,251
Alternative Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		17,758	18,847
Alternative Investment Funds [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	[1]	17,758	18,847
Debt Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		410,723	417,465
Debt Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		10,990	11,978
Debt Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		81,417	83,401
Debt Funds [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	[1]	318,316	322,086
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		212,598	216,866
Equity Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		141,390	199,201
Equity Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		60,118	6,287
Equity Funds [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	[1]	11,090	11,378
Derivatives [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		3,169	1,946
Derivatives [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value		$ 3,169	$ 1,946

[1] Represents certain investments measured at NAV or its equivalent as a practical expedient in determining fair value. In accordance with current accounting guidance, these investments have not been classified in the fair value hierarchy.