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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 5.9 | $ 5.8 | $ 5.7
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution | 15.1 |  |
Expect to recognize unrecognized actuarial gains (losses) | (14.4) |  |
Expect to recognize prior service credit\cost | $ 0.2 |  |
U.S. Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 3.90% | 4.10% |
Long-term return on plan assets | 7.50% | 7.50% | 7.50%
Weighted average discount rate used in determining the net periodic cost | 4.10% | 3.80% | 4.50%
U.S. Defined Benefit Pension Plans | CMRT | Level 1 and Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of fair value of asset | 92.00% | 91.00% |
Foreign Pension Plan Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.10% | 2.60% |
Long-term return on plan assets | 3.90% | 4.60% | 5.00%
Weighted average discount rate used in determining the net periodic cost | 2.60% | 2.50% | 3.80%
Foreign Pension Plan Defined Benefit | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average basis points of long-term rate of return on investment | 1.25% |  |
Foreign Pension Plan Defined Benefit | Level 3 Inputs | Norway |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 11.00% |  |
Foreign Pension Plan Defined Benefit | Equity Securities | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 35.00% |  |
Foreign Pension Plan Defined Benefit | Equity Securities | Norway |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 7.00% |  |
Percentage of plan asset allocation | 11.00% |  |
Foreign Pension Plan Defined Benefit | Fixed Income Funds | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 65.00% |  |
Foreign Pension Plan Defined Benefit | Fixed Income Funds | Norway |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 3.00% |  |
Percentage of plan asset allocation | 79.00% |  |
Foreign Pension Plan Defined Benefit | Real Estate | Norway |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 5.00% |  |
Percentage of plan asset allocation | 7.00% |  |
Foreign Pension Plan Defined Benefit | Other Investments And Liquid Funds | Norway |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 7.00% |  |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution | $ 1.1 |  |
Discount rate | 3.40% | 3.60% |
Expect to recognize unrecognized actuarial gains (losses) | $ 0.2 |  |
Expect to recognize prior service credit\cost | $ 1.1 |  |
Eligible age for health care benefits | 65 years |  |
Weighted average discount rate used in determining the net periodic cost | 3.60% | 3.40% | 4.00%

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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