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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Income Tax Rate Reconciliation [Line Items]      
U.S. federal statutory income tax rate, Amount $ (184) $ 6,246 $ 23,797
U.S. state and local income taxes, net of U.S. federal income tax benefits, Amount (1,585) 840 3,569
Unrecognized tax benefits , Amount 1,524    
Tax exempt income, net of interest expense, Amount (561) (647) (473)
Business promotion and other non-deductible expenses, Amount 851 620 616
Adjustments to reflect prior year tax return filings, Amount (294) (552) 24
Tax rate change on deferred income taxes, Amount 390 (734) 955
Insurance proceeds, non-taxable, Amount (349) (821)  
Non-U.S. Operations, Amount 678 348 (232)
Other, Amount (146) (69) (1,045)
Income tax provision $ 324 $ 5,231 $ 27,211
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   4.70% 5.20%
Unrecognized tax benefits, Percentage   0.00% 0.00%
Tax exempt income, net of interest expense, Percentage   (3.60%) (0.70%)
Business promotion and other non-deductible expenses, Percentage   3.50% 0.90%
Adjustments to reflect prior year tax return filings, Percentage   (3.10%) 0.00%
Tax rate change on deferred income taxes, Percentage   (4.10%) 1.40%
Insurance proceeds, non-taxable, Percentage   (4.60%) 0.00%
Non-U.S. Operations, Percentage   1.90% (0.30%)
Other, Percentage   (0.40%) (1.50%)
Total Income Tax Expense, Percentage   29.30% 40.00%