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Income Taxes - Reconciliation of Tax Provision for Continuing Operations (Detail)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items]      
Tax provision at U.S. statutory rate 35.00% 35.00% 35.00%
Valuation allowance on deferred tax assets 27.70% (108.10%) 14.10%
Tax exempt interest (19.70%) 4.10% 2.40%
Audit settlements (13.20%)    
Foreign tax rate differential (3.00%) 1.20% 0.20%
U.S. permanent items 2.70%    
Tax credits (2.00%) 7.20% 12.60%
State and local income tax 1.40% 0.50% 5.60%
Tax on undistributed foreign earnings 1.30% (21.80%)  
Medicare Part D subsidy (1.10%) 0.40% (4.20%)
U.S. tax on foreign earnings 0.30% (6.80%) (16.00%)
Change in state tax rate   9.70%  
Other adjustments (2.80%) (3.90%) 2.50%
Effective income tax rate 26.60% (82.50%) 52.20%