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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Segment
Mar. 31, 2013
Dec. 31, 2013
Organization And Summary Of Significant Accounting Policies [Line Items]      
Cash and investments in marketable securities $ 309,071,000   $ 262,026,000
Indebtedness 164,200,000    
Senior secured notes, issued 125,000,000   125,000,000
Senior secured notes, interest rate 12.00%    
Restricted cash 25,000,000   25,000,000
Number of business segments 1    
Effective income tax rate 34.00% 34.00%  
12% Senior Secured Notes Due July 2017 [Member]
      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Senior secured notes, interest rate 12.00%    
Maturity date of senior secured notes Jul. 15, 2017    
Restricted cash $ 25,000,000