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Retirement Benefits - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | $ (17,131) | $ 2,829 | $ 9,949
Multi employer pension plan contributions | 6,423 | 6,482 | 6,715
Defined contribution plans contributions charged to expense | $ 11,800 | 9,800 | $ 9,500
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 |  |
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Equity securities, target allocation as percentage of total equity securities | 85.00% |  |
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 | $ 101,200 | 71,000 |
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation | $ 96,200 | $ 66,200 |
Benefit obligation discount rate | 2.10% | 1.90% |
Benefit obligation rate of compensation increase | 3.30% | 3.50% |
Net periodic benefit cost discount rate | 1.90% | 2.60% | 2.00%
Net periodic benefit cost rate of compensation increase | 3.30% | 3.50% | 3.50%
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation, pension benefit plans | $ 779,100 | $ 697,500 |
Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation discount rate | 3.80% | 4.40% |
Benefit obligation rate of compensation increase | 2.60% | 2.80% |
Net periodic benefit cost discount rate | 4.40% | 4.70% | 4.10%
Net periodic benefit cost rate of compensation increase | 2.80% | 3.10% | 3.00%

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