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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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