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Income Taxes - Reconciliation of Statutory Federal Tax Rate to Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 35.00% 34.00% 34.00%
Earnings excluded from Federal tax 0.00% 0.00% (14.00%)
State income taxes, net of Federal income tax benefit 4.00% 4.00% 29.00%
Nondeductible expenses 3.00% 4.00% 4.00%
Research credit, Federal benefit (1.00%) (0.00%) (0.00%)
Section 199 - Qualified production activities (3.00%) (0.00%) (0.00%)
Other 0.00% (1.00%) 3.00%
Effective income tax rate 38.00% 41.00% 56.00%