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Retirement Benefits - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Investment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | $ 1,599 | $ 3,914 | $ (17,131)
Multi employer pension plan contributions | 4,785 | 5,292 | 6,423
Defined contribution plans contributions charged to expense | $ 14,400 | 12,000 | $ 11,800
Target Allocation | 100.00% |  |
Plan assets held under management by single investment company | 99.00% |  |
Number of commingled debt and equity index funds | Investment | 6 |  |
Number of asset funds individually in excess of ten percent of total plan assets | Investment | 4 |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multi Employer Funded Status | 65.00% |  |
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligations in excess of plan assets, projected benefit obligation | $ 109,000 | 95,600 |
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation | $ 103,900 | $ 93,100 |
Benefit obligation discount rate | 1.50% | 2.20% |
Net periodic benefit cost discount rate | 2.20% | 2.10% | 1.90%
Net periodic benefit cost rate of compensation increase | 3.30% | 3.30% | 3.30%
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation, pension benefit plans | $ 828,000 | $ 728,700 |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 58.00% |  |
Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 42.00% |  |
Equity securities—U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 49.00% |  |
Equity securities, target allocation as percentage of total equity securities | 85.00% |  |

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