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Employee Benefit, Retirement, and Deferred Compensation Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Contribution made to consolidated defined benefit plan $ 0.2 $ 0.1  
Unfunded status of consolidated defined benefit plan 5.4   5.9
U.S. Cash Balance Plan [Member] | U.K. Supplementary Pension Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Age of participants entitled to fixed monthly pension and fixed survivor benefit 65    
Accrued obligations 1.8   1.8
Monarch Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Total expense for the defined contribution plan $ 0.2 $ 0.2