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Fair value measurement - Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | $ 479,735 |  |
Retirement Plans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 479,735 | $ 407,550 | $ 439,149
Total | 160,809 | 123,454 |
Retirement Plans | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | 160,809 | 123,454 |
Retirement Plans | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | 0 | 0 |
Retirement Plans | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total | 0 | 0 |
Retirement Plans | Cash and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 1,395 | 958 |
Retirement Plans | Cash and other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 1,395 | 958 |
Retirement Plans | Cash and other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 0 | 0 |
Retirement Plans | Cash and other | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 0 | 0 |
Retirement Plans | Corporate stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 111,193 | 83,489 |
Retirement Plans | Corporate stock | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 111,193 | 83,489 |
Retirement Plans | Corporate stock | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 0 | 0 |
Retirement Plans | Corporate stock | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 0 | 0 |
Retirement Plans | Interest in registered investment companies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 48,221 | 39,007 |
Retirement Plans | Interest in registered investment companies | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 48,221 | 39,007 |
Retirement Plans | Interest in registered investment companies | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 0 | 0 |
Retirement Plans | Interest in registered investment companies | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value of plan assets | 0 | 0 |
Retirement Plans | Common collective trust - equities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension plan investments valued using net asset value as a practical expedient: | 111,385 | 104,993 |
Retirement Plans | Common collective trust - fixed income |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension plan investments valued using net asset value as a practical expedient: | 185,844 | 158,580 |
Retirement Plans | Hedge funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension plan investments valued using net asset value as a practical expedient: | 17,125 | 16,126 |
Retirement Plans | Partnership/joint venture interests |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension plan investments valued using net asset value as a practical expedient: | $ 4,572 | $ 4,397 |

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