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Employee Benefit Plans - Plan Assets Measured and Reported in Financial Statements at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 401,929	$ 460,952
U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,803	5,101
U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,714	37,323
International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,034	11,137
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	610	611
Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	303	1,975
Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,964	6,968
Insurance buy-in policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29,857	33,553
Collective trust funds, U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69,699	73,727
Collective trust funds, International equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	176,103	234,472
Collective trust funds, International fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,752	16,179
Collective trust funds, diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,090	39,906
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	913	2,586
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
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	610	611
Level 1 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	303	1,975
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	75,515	60,529
Level 2 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,803	5,101
Level 2 | U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,714	37,323
Level 2 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,034	11,137
Level 2 | Mutual funds
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	7,964	6,968
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	29,857	33,553
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
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	$ 29,857	$ 33,553

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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