Summary of Fair Value of Plan Assets by Asset Category (Parenthetical) (Detail) (UNITED KINGDOM)	12 Months Ended
	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%