Income Taxes - Schedule of Reconciliation of Statutory U.S. Federal Income Tax Rate to Effective Income Tax Rate for Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Statutory U.S. federal income tax rate	(35.00%)	(35.00%)	(35.00%)
State and local income taxes	(2.70%)	(2.60%)	(4.00%)
Nondeductible goodwill		0.60%	1.80%
Valuation allowance	0.60%	37.00%	44.80%
Valuation allowance release	(116.30%)
Federal audit settlement		2.40%
Tax credits	(0.20%)		(3.20%)
Other	(2.50%)	0.30%	(4.10%)
Effective income tax rate	(156.10%)	2.70%	0.30%