Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate with Federal and State Overall Effective Income Tax Rate from Continuing Operations (Detail)

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Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate with Federal and State Overall Effective Income Tax Rate from Continuing Operations (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 35.00% 35.00% 35.00%
Effective state income tax rate 3.26% 3.15% 3.22%
Valuation allowance adjustments (0.45%) (0.14%) 0.33%
Uncertain tax positions (0.14%) (0.08%) (1.76%)
Other 1.64% 1.13% (2.42%)
Effective income tax rate 39.31% 39.06% 34.37%