Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended
	Jan. 05, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 25, 2015	Jan. 06, 2015
Subsequent Event [Line Items]
Restricted cash received from WMMRC		$ 2,447,000	$ 115,000
Notes payable - principal		31,220,000	105,502,000
Convertible preferred stock, shares issued		1,000,000	0
2012 Plan
Subsequent Event [Line Items]
Number of shares authorized and available for awards		3,000,000
Subsequent Event
Subsequent Event [Line Items]
Escrow deposit	598,500,000
Loans Outstanding under financing agreement	0
Subsequent Event | 2012 Plan
Subsequent Event [Line Items]
Number of shares authorized and available for awards				12,000,000
Subsequent Event | Runoff Notes [Member]
Subsequent Event [Line Items]
Repayment of notes payable-principal					2,300,000
Repayment of notes payable-interest					29,000
Subsequent Event | First Lien Runoff Notes [Member]
Subsequent Event [Line Items]
Notes payable - principal					665,000
Subsequent Event | Second Lien Runoff Notes [Member]
Subsequent Event [Line Items]
Notes payable - principal					$ 28,300,000
Subsequent Event | Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock, Shares	600,000
Convertible preferred stock, shares issued	600,000
Subsequent Event | Series B Preferred Stock [Member] | Affiliates of KKR [Member]
Subsequent Event [Line Items]
Convertible preferred stock, shares issued	200,000
Subsequent Event | Series B Preferred Stock [Member] | Citi
Subsequent Event [Line Items]
Convertible preferred stock, shares issued	400,000
Subsequent Event | Series B Preferred Stock [Member] | Scenario, Previously Reported | Affiliates of KKR [Member]
Subsequent Event [Line Items]
Convertible preferred stock, shares issued	400,000
Subsequent Event | Series B Preferred Stock [Member] | Scenario, Previously Reported | Citi
Subsequent Event [Line Items]
Convertible preferred stock, shares issued	200,000