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%