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Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Oct. 31, 2010 UNITED KINGDOM | Dec. 31, 2013 UNITED KINGDOM | Dec. 31, 2012 UNITED KINGDOM | Dec. 31, 2013 JAPAN | Dec. 31, 2012 JAPAN | Dec. 31, 2013 Global Equities | Dec. 31, 2013 Global Bonds | Dec. 31, 2013 Alternative Assets | Dec. 31, 2013 Cash
Employee Benefit Plan [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Funding valuation period |  |  |  | 3 years |  |  |  |  |  |  |  |
Defined benefit plan contributions by employer | $ 1,800,000 | $ 1,500,000 | $ 1,800,000 | $ 1,000,000 | $ 847,000 | $ 793,000 | $ 628,000 | $ 324,000 |  |  |  |
Defined benefit plan estimated employer contributions for 2014 |  |  |  |  | $ 1,000,000 |  | $ 100,000 |  |  |  |  |
Defined benefit plan, target plan asset allocations |  |  |  |  |  |  |  |  | 61.00% | 23.00% | 9.00% | 7.00%

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- Details
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- Definition Number of years between funding valuations are performed for pension plan + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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)(3) -URI http://asc.fasb.org/extlink&oid=28361610&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=28361610&loc=d3e1928-114920 + 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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