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Employee Benefit Plans - Plan Assets Measured and Reported in Financial Statements at Fair Value (Detail) - Defined benefit pension plans - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 457,880	$ 431,747	$ 401,929
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323	618
Level 1 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Mutual funds (a)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323	618
Level 1 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Insurance "buy-in" policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109,779	102,905
Level 2 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,132	16,196
Level 2 | U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69,708	57,669
Level 2 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,490	14,088
Level 2 | Mutual funds (a)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,449	14,952
Level 2 | Insurance "buy-in" policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,794	31,281
Level 3 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Mutual funds (a)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Insurance "buy-in" policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,794	31,281
Fair Value, Inputs, Level 1, 2 and 3 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,132	16,196
Fair Value, Inputs, Level 1, 2 and 3 | U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69,708	57,669
Fair Value, Inputs, Level 1, 2 and 3 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,490	14,088
Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds (a)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	73,314	74,750
Fair Value, Inputs, Level 1, 2 and 3 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323	618
Fair Value, Inputs, Level 1, 2 and 3 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,449	14,952
Fair Value, Inputs, Level 1, 2 and 3 | Insurance "buy-in" policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,794	31,281
Fair Value Measured at Net Asset Value Per Share | Collective trust funds, U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	86,175	78,170
Fair Value Measured at Net Asset Value Per Share | Collective trust funds, International equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	94,812	89,381
Fair Value Measured at Net Asset Value Per Share | Collective trust funds, International fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,799	15,387
Fair Value Measured at Net Asset Value Per Share | Collective trust funds, diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 42,884	$ 39,255

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+ References

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