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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Other Assets | Dec. 31, 2012 Other Assets | Dec. 31, 2013 Defined Benefit Pension Plans | Dec. 31, 2012 Defined Benefit Pension Plans | Dec. 31, 2013 Defined Benefit Pension Plans Real estate Norway | Dec. 31, 2012 Defined Benefit Pension Plans Real estate Norway | Dec. 31, 2013 Defined Benefit Pension Plans Level 3 Inputs | Dec. 31, 2012 Defined Benefit Pension Plans Level 3 Inputs | Dec. 31, 2011 Defined Benefit Pension Plans Level 3 Inputs | Dec. 31, 2013 Defined Benefit Pension Plans Level 3 Inputs Real estate Norway | Dec. 31, 2012 Defined Benefit Pension Plans Level 3 Inputs Real estate Norway | Dec. 31, 2013 U.S. Defined Benefit Pension Plans | Dec. 31, 2012 U.S. Defined Benefit Pension Plans | Dec. 31, 2011 U.S. Defined Benefit Pension Plans | Dec. 31, 2013 Foreign Pension Plan Defined Benefit | Dec. 31, 2012 Foreign Pension Plan Defined Benefit | Dec. 31, 2011 Foreign Pension Plan Defined Benefit | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Canada BasisPoint | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Other Assets Norway | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Equity Securities Canada | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Equity Securities Norway | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Fixed Income Funds Canada | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Fixed Income Funds Norway | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Other Investments Canada | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Real estate Norway | Dec. 31, 2013 Foreign Pension Plan Defined Benefit Level 3 Inputs Norway | Dec. 31, 2013 OPEB | Dec. 31, 2012 OPEB | Dec. 31, 2011 OPEB | Dec. 31, 2013 CMRT U.S. Defined Benefit Pension Plans | Dec. 31, 2012 CMRT U.S. Defined Benefit Pension Plans | Dec. 31, 2011 CMRT U.S. Defined Benefit Pension Plans | Dec. 31, 2012 CMRT U.S. Defined Benefit Pension Plans Plan assets attributable to disposition of certain investments | Dec. 31, 2013 CMRT U.S. Defined Benefit Pension Plans Level 1 and Level 2 | Dec. 31, 2012 CMRT U.S. Defined Benefit Pension Plans Level 1 and Level 2 | Jan. 31, 2014 CMRT U.S. Defined Benefit Pension Plans Subsequent Event
Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan expense | $ 4.2 | $ 3.9 | $ 3.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected contribution |  |  |  |  |  | 27.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% | 3.60% |  | 3.80% | 3.70% |  |  |  |  |  |  |  |  |  |  | 4.00% | 3.47% |  |  |  |  |  |  |  |
Expect to recognize unrecognized actuarial losses |  |  |  |  |  | 11.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expect to recognize prior service credit\cost |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.1 |  |  |  |  |  |  |  |  |
Expect to recognize transition obligations, Net |  |  |  |  |  | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of average annual rate of return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |  |  |  |  |
Long-term return on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% | 5.00% | 5.20% | 5.50% |  | 4.00% |  | 8.00% |  | 4.00% |  | 6.00% |  |  |  |  | 10.00% | 10.00% | 10.00% |  |  |  | 7.50%
Percentage of fair value of asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83.00% | 83.00% |
Plan assets |  |  |  |  |  | 496.6 | 460.6 | 4.8 | 5.5 | 261.5 | 238.1 | 200.6 | 4.8 | 5.5 | 54.9 | 50.7 | 45.4 | 441.6 | 409.9 | 343.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 254.7 |  |  |
Percentage of aggregate assets value | 100.00% | 100.00% |  | 1.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average basis points of long-term rate of return on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of plan asset allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% | 12.00% | 48.00% | 78.00% | 7.00% | 9.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of assumed long-term rate of return for plan assets invested |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% | 5.00% | 5.20% | 5.50% |  | 4.00% |  | 8.00% |  | 4.00% |  | 6.00% |  |  |  |  | 10.00% | 10.00% | 10.00% |  |  |  | 7.50%
Percentage of plan asset allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Weighted average discount rate used in determining the net periodic cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.60% | 4.20% | 5.10% | 3.70% | 4.90% | 5.10% |  |  |  |  |  |  |  |  |  | 3.47% | 3.93% | 4.65% |  |  |  |  |  |  |
Curtailment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.1 |  |  |  |  |  |  |  |  | (0.1) |  |  |  |  |  |  |  |  |
Defined benefit plan, special termination benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Amount included in accumulated other comprehensive income (AOCI) related to transition obligation (asset) expected to be recognized as components of net periodic benefit cost (credit) for the fiscal year that follows the most recent annual 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 (s) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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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=28361610&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=28361610&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 -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 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=28361610&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=28361610&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 Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan 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 (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + 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 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=28361610&loc=d3e1928-114920 + 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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Termination Benefits -URI http://asc.fasb.org/extlink&oid=6526498 + 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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=28361610&loc=d3e2446-114920 + 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=28361610&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=28361610&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=6414718&loc=d3e28014-114942 + Details
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- Definition Combined Master Retirement Trust Asset Fair Value Input Percentage + References No definition available. + Details
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- Definition Defined Benefit Plan Expected Return On Investment Spread Above Index Return + References No definition available. + Details
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- Details
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- Definition Actual allocation percentage of CMRT plan assets according to the asset category (domestic equities, international equities, fixed income securities, privately managed limited partnerships, other). + References No definition available. + Details
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- Definition Percentage Of Defined Benefit Plan Actual Return On Plan Assets + References No definition available. + Details
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