Income Taxes - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	$ 6,000,000		$ 93,100,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ (90,200,000)
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 323,900,000