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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 benefit plan expense	$ 2.8	$ 2.7	$ 2.6
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions next fiscal year	14.8
Unrecognized actuarial losses to be recognized in next fiscal year	12.8
Unrecognized prior service cost to be recognized in next fiscal year	$ 0.2
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.10%
Expected long-term rate of return	7.50%	7.50%	7.50%
United States Pension Plans of US Entity, Defined Benefit | CMRT
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.50%	7.50%	7.50%
United States Pension Plans of US Entity, Defined Benefit | CMRT | Level 1 and Level 2
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value of asset	92.00%	91.00%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.10%	2.60%
Expected long-term rate of return	3.90%	4.60%	5.00%
Foreign Pension Plans, Defined Benefit | Equity Securities | Canada
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	35.00%
Average basis points of long-term rate of return on investment	125 basis points above the applicable equity or fixed income index
Foreign Pension Plans, Defined Benefit | Equity Securities | Norway
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.00%
Target asset allocation	11.00%
Foreign Pension Plans, Defined Benefit | Debt Securities | Canada
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	65.00%
Average basis points of long-term rate of return on investment	125 basis points above the applicable equity or fixed income index
Foreign Pension Plans, Defined Benefit | Debt Securities | Norway
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	3.00%
Target asset allocation	79.00%
Foreign Pension Plans, Defined Benefit | Other Investment Securities And Cash | Canada
Defined Benefit Plan Disclosure [Line Items]
Average basis points of long-term rate of return on investment	125 basis points above the applicable equity or fixed income index
Foreign Pension Plans, Defined Benefit | Other Investment Securities And Cash | Norway
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.00%
Foreign Pension Plans, Defined Benefit | Real Estate | Norway
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	5.00%
Target asset allocation	7.00%
Foreign Pension Plans, Defined Benefit | Real Estate And Other Investments | Norway
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	11.00%

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- Definition

Combined master retirement trust asset fair value input percentage.

+ References

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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

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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

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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.

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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.

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A narrative description of the basis used to determine the overall expected long-term rate-of-return on assets assumption, such as the general approach used, the extent to which the overall rate-of-return on assets assumption was based on historical returns, the extent to which adjustments were made to those historical returns to reflect expectations of future returns, and how those adjustments were determined. The description would generally consider the major categories of assets.

+ 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 (d)(3)
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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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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
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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

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-Publisher FASB
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The amount of the cost recognized during the period for defined contribution plans.

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