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Employee Benefit, Retirement, and Deferred Compensation Plans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Monarch Plan [Member]
Sep. 30, 2013
Monarch Plan [Member]
Sep. 30, 2014
Monarch Plan [Member]
Sep. 30, 2013
Monarch Plan [Member]
Sep. 30, 2014
U.S. Cash Balance Plan [Member]
U.K. Supplementary Pension Plan [Member]
Dec. 31, 2013
U.S. Cash Balance Plan [Member]
U.K. Supplementary Pension Plan [Member]
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