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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 5.8 | $ 5.7 | $ 4.2
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution | 15.8 |  |
Expect to recognize unrecognized actuarial losses | 12.8 |  |
Expect to recognize prior service credit\cost | $ 0.2 |  |
U.S. Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.10% | 3.80% |
Long-term return on plan assets | 7.50% | 7.50% | 10.00%
Weighted average discount rate used in determining the net periodic cost | 3.80% | 4.50% | 3.60%
U.S. Defined Benefit Pension Plans | CMRT |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of average annual rate of return |  |  | 14.00%
Long-term return on plan assets |  |  | 10.00%
U.S. Defined Benefit Pension Plans | CMRT | Level 1 and Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of fair value of asset | 81.00% | 80.00% |
Foreign Pension Plan Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.60% | 2.50% |
Long-term return on plan assets | 4.60% | 5.00% | 5.00%
Weighted average discount rate used in determining the net periodic cost | 2.50% | 3.80% | 3.70%
Foreign Pension Plan Defined Benefit | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment |  |  | $ 7.1
Defined benefit plan, special termination benefits |  |  | $ 0.2
Average basis points of long-term rate of return on investment | 1.25% |  |
Foreign Pension Plan Defined Benefit | Canada | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 38.00% |  |
Foreign Pension Plan Defined Benefit | Canada | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 55.00% |  |
Foreign Pension Plan Defined Benefit | Canada | Other Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 7.00% |  |
Foreign Pension Plan Defined Benefit | Norway | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of plan asset allocation | 11.00% |  |
Foreign Pension Plan Defined Benefit | Norway | Equity Securities |  |  |
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 | Norway | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 5.00% |  |
Percentage of plan asset allocation | 79.00% |  |
Foreign Pension Plan Defined Benefit | Norway | Real estate |  |  |
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 | Norway | Money Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long-term return on plan assets | 3.00% |  |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution | $ 1.1 |  |
Discount rate | 3.60% | 3.40% |
Expect to recognize unrecognized actuarial losses | $ 0.2 |  |
Expect to recognize prior service credit\cost | $ 1.8 |  |
Weighted average discount rate used in determining the net periodic cost | 3.40% | 4.00% | 3.50%

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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=58740216&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=58740216&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=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + 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 The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Termination Benefits -URI http://asc.fasb.org/extlink&oid=6526498 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&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=58740216&loc=d3e1928-114920 + Details
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