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Summary of Fair Value of Plan Assets by Asset Category (Parenthetical) (Detail) (UNITED KINGDOM) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Cash | Balanced Fund |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 8.00% | 3.00%
Cash | Growth Funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 7.00% | 1.00%
Equity Securities | Balanced Fund |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 51.00% | 47.00%
Equity Securities | Growth Funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 70.00% | 68.00%
Debt Securities | Balanced Fund |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 33.00% | 41.00%
Debt Securities | Growth Funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 14.00% | 21.00%
Other Assets | Balanced Fund |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 8.00% | 9.00%
Other Assets | Growth Funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 9.00% | 10.00%

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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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