Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State	4.30%	3.10%	(2.30%)
State apportionment rate change	(0.20%)	(0.20%)	(14.90%)
Non-deductible executive compensation	(0.10%)	0.20%	0.70%
Valuation allowances	(6.80%)	0.20%	3.50%
Other	0.00%	0.20%	0.60%
Consolidated effective tax rate	32.20%	38.50%	22.60%