Employee Benefit, Retirement, and Deferred Compensation Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||
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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]
|
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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]
|
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Defined Benefit Plan Disclosure [Line Items] | |||
Total expense for the defined contribution plan | $ 0.2 | $ 0.2 |