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Defined Contribution and Defined Benefit Retirement - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 6.6 | $ 5.5 | $ 5.6
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution | 18.2 |  |
Expect to recognize unrecognized actuarial gains (losses) | 15.6 |  |
Expect to recognize prior service credit\cost | $ 0.2 |  |
Defined Benefit Pension Plans | Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.10% | 2.10% |
Long-term return on plan assets | 3.00% | 2.50% | 3.90%
Defined Benefit Pension Plans | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average basis points of long-term rate of return on investment | 1.25% |  |
Defined Benefit Pension Plans | Canada | Equity Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 20.00% |  |
Defined Benefit Pension Plans | Canada | Equity Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 30.00% |  |
Defined Benefit Pension Plans | Canada | Fixed Income Funds | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 70.00% |  |
Defined Benefit Pension Plans | Canada | Fixed Income Funds | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 80.00% |  |
Defined Benefit Pension Plans | Norway | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 10.00% |  |
Defined Benefit Pension Plans | Norway | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 7.00% |  |
Percentage of plan asset allocation | 11.00% |  |
Defined Benefit Pension Plans | Norway | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 3.00% |  |
Percentage of plan asset allocation | 79.00% |  |
Defined Benefit Pension Plans | Norway | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 5.00% |  |
Percentage of plan asset allocation | 7.00% |  |
Defined Benefit Pension Plans | Norway | Other Investments And Liquid Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 8.00% |  |
Defined Benefit Pension Plans | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.10% | 3.50% |
Long-term return on plan assets | 7.50% | 7.50% | 7.50%
Defined Benefit Pension Plans | U.S. | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 29.00% |  |
Defined Benefit Pension Plans | U.S. | CMRT |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 3.00% |  |
Defined Benefit Pension Plans | U.S. | CMRT | Level 1 and Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of fair value of asset |  | 93.00% |
Defined Benefit Pension Plans | U.S. | CMRT | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan investment | 6.00% |  |
Defined Benefit Pension Plans | U.S. | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 9.00% |  |
Percentage of plan asset allocation | 40.00% |  |
Defined Benefit Pension Plans | U.S. | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 5.00% |  |
Percentage of plan asset allocation | 45.00% |  |

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