Reconciliation of Effective Federal Tax Rates with Statutory Federal Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	34.00%	34.00%	34.00%
State income taxes	(0.60%)	4.90%	2.20%
Foreign income taxes	(0.40%)	0.00%	0.00%
Deferred tax valuation allowance	(26.50%)	(131.30%)	(10.60%)
Fair value adjustments	(1.20%)	14.70%	(14.90%)
Revisions to prior years	19.10%	171.40%	2.10%
Other permanent items	(2.10%)	(0.10%)	(0.20%)
Other	0.00%	4.70%	2.30%
Effective tax rate	22.30%	98.30%	14.90%