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Income Taxes - Summary of Effective Tax Rate for Continuing Operations Differed from U.S. Statutory Federal Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Statutory federal tax rate 35.00% (35.00%) 35.00%
State taxes, net of federal benefit 4.30% 0.60% 3.40%
Valuation allowance on capital loss carryforward and state tax credit carryforward (2.10%) (0.20%) (0.50%)
Adjustment for final positions on filed returns (3.50%) (0.80%) (0.30%)
Nondeductible expenses and other, net 6.10% 3.60% 6.90%
Federal tax-exempt interest income (0.10%) (0.20%) (0.20%)
Federal and state tax credits (14.30%) (6.90%) (15.70%)
Other, net 2.10% (1.20%) (2.10%)
Total 27.50% (40.10%) 26.50%