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Pension Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended
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Jun. 30, 2010 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2013 United Kingdom Government Gilts [Member] | Dec. 31, 2012 United Kingdom Government Gilts [Member] | Dec. 31, 2013 Debt Securities [Member] | Dec. 31, 2013 Equity Securities [Member] | Dec. 31, 2013 United Kingdom Plan [Member] | Dec. 31, 2012 United Kingdom Plan [Member] | Dec. 31, 2011 United Kingdom Plan [Member] | Dec. 31, 2013 United Kingdom Plan [Member] Index-Tracking Funds [Member] | Dec. 31, 2012 United Kingdom Plan [Member] Index-Tracking Funds [Member] | Dec. 31, 2013 United Kingdom Plan [Member] Debt Securities [Member] | Dec. 31, 2012 United Kingdom Plan [Member] Debt Securities [Member] | Dec. 31, 2011 United Kingdom Plan [Member] Debt Securities [Member] | Dec. 31, 2013 United Kingdom Plan [Member] Equity Securities [Member] | Dec. 31, 2012 United Kingdom Plan [Member] Equity Securities [Member] | Dec. 31, 2011 United Kingdom Plan [Member] Equity Securities [Member] | Dec. 31, 2013 German Plan [Member]
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement age of service |  | 65 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduced in Projected Benefit Obligation (PBO) | $ 17.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining life expectancy of Plan pensioners |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average remaining life expectancy of the inactive participants |  | 24 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cash contribution |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage change in discount rate |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount change in PBO due to discount rate |  | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount change in net pension charge due to discount rate |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount change in PBO due to change price inflation |  | 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount change in net pension charge due to change price inflation |  | 1.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage change in price inflation |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of asset allocation, actual |  |  |  |  | 25.00% | 25.00% |  |  |  |  |  | 55.00% | 55.00% |  |  |  |  |  |  |
Asset allocation |  |  |  |  |  |  | 65.00% | 35.00% | 100.00% | 100.00% | 100.00% |  |  | 61.00% | 61.00% | 66.00% | 35.00% | 33.00% | 29.00% |
Maximum percentage of Plan's assets invested in individual company's investment funds |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation for the Plan |  | 819.8 | 805.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of unrecognized actuarial net losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6
Amount of unrecognized actuarial net losses, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6
Amount of contributions to defined contribution schemes |  | $ 7.7 | $ 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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