Income Taxes - Statutory Rate and Provisions for Income Taxes Percent (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal Statutory Tax Rate	35.00%	35.00%	35.00%
State Income Taxes, net of federal benefit	3.90%	3.50%	3.50%
Nondeductible Expense	2.50%	2.30%	3.10%
Credits and other	(0.00%)	(0.90%)	(0.00%)
Effective Tax Rate	41.40%	39.90%	41.60%