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Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax rate, Amount $ 15,368 $ (184) $ 6,246
U.S. state and local income taxes, net of U.S. federal income tax benefits, Amount 2,131 (1,585) 840
Unrecognized tax benefit, Amount 1,244 1,524  
Tax exempt income, net of interest expense, Amount (715) (561) (647)
Business promotion and other non-deductible expenses, Amount 660 851 620
Insurance proceeds, non-taxable, Amount (597) (349) (821)
Adjustment to reflect prior year tax return filings, Amount (251) (294) (552)
Tax rate change on deferred income taxes, Amount 208 390 (734)
Non-U.S. operations, Amount 185 678 348
Other, Amount (477) (146) (69)
Income tax provision $ 17,756 $ 324 $ 5,231
U.S. federal statutory income tax rate, Percentage 35.00% 35.00% 35.00%
U.S. state and local income taxes, net of U.S. federal income tax benefits, Percentage 4.90%   4.70%
Unrecognized tax benefits, Percentage 2.80%   0.00%
Tax exempt income, net of interest expense, Percentage (1.60%)   (3.60%)
Business promotion and other non-deductible expenses, Percentage 1.50%   3.50%
Insurance proceeds, non-taxable, Percentage (1.40%)   (4.60%)
Adjustment to reflect prior year tax return filings, Percentage (0.60%)   (3.10%)
Tax rate change on deferred income taxes, Percentage 0.50%   (4.10%)
Non-U.S. operations, Percentage 0.40%   1.90%
Other, Percentage (1.10%)   (0.40%)
Total income tax expense, Percentage 40.40%   29.30%