Employee Benefit, Retirement, and Deferred Compensation Plans - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||
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Sep. 30, 2014
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Sep. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2014
Monarch Plan [Member]
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Sep. 30, 2013
Monarch Plan [Member]
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Sep. 30, 2014
Monarch Plan [Member]
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Sep. 30, 2013
Monarch Plan [Member]
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Sep. 30, 2014
U.S. Cash Balance Plan [Member]
U.K. Supplementary Pension Plan [Member]
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Dec. 31, 2013
U.S. Cash Balance Plan [Member]
U.K. Supplementary Pension Plan [Member]
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Defined Benefit Plan Disclosure [Line Items] | |||||||||
Accrued obligations | $ 1,700,000 | $ 1,800,000 | |||||||
Unfunded status of consolidated defined benefit plan | 6,800,000 | 6,800,000 | 5,900,000 | ||||||
Contribution made to consolidated defined benefit plan | 47,000 | 455,000 | |||||||
Total expense for the defined contribution plan | $ 200,000 | $ 200,000 | $ 500,000 | $ 500,000 |