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Stockholders Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
May 13, 2010
May 31, 2010
Series D Junior Participating Preferred Stock
Dec. 31, 2012
Series D Junior Participating Preferred Stock
Dec. 31, 2011
Series D Junior Participating Preferred Stock
Dec. 31, 2012
Unclassified Preferred Stock
Sep. 17, 2010
Replacement Warrant
May 28, 2010
IPO
May 28, 2010
Private Placement
May 28, 2010
Trailer Investments
May 13, 2010
Minimum
May 13, 2010
Maximum
The number of authorized shares of common stock, par value $ 0.01 $ 0.01 $ 0.01           $ 0.01        
Common stock, Shares authorized 200,000,000 200,000,000                   75,000,000 200,000,000
All Classes Of Shares Authorized                       100,000,000 225,000,000
Beginning Balance 0 0 25,000,000     0              
Preferred Stock, Par or Stated Value Per Share     $ 0.01 $ 0.01                  
Public offering (in shares)                 11,750,000 16,137,500      
Sale of Stock, Price Per Share                     $ 6.50    
Excess Stock, Shares Issued                     3,637,500    
Proceeds from Issuance of Common Stock                 $ 76.4        
Class of warrant or right, number of securities called by warrants or rights               9,349,032          
Class of warrant or right exercise price of warrants or rights               $ 6.75          
Stock Issued During Period, Shares, Conversion of Convertible Securities 24,762,636             9,349,032          
Stock forfeiture during period shares conversion of convertible securities               13,549          
Stock Repurchased During Period, Shares       300,000                  
Preferred Stock, Shares Authorized             25,000,000            
Preferred Stock, Shares Issued         0                
Business Acquisition Stockholders Rights Plan Exercise Description The rights will be exercisable only if a person or a group acquires or announces a tender or exchange offer to acquire 20% or more of our common stock or if we enter into other business combination transactions not approved by our board of directors.                        
Business Acquisition Stockholders Rights Plan Expire Date Dec. 28, 2015                        
Business Acquisition Stockholders Rights Plan Redeemable Per Stock $ 0.01                        
Business Acquisition, Share Price         $ 120 $ 120