Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Segment	Sep. 30, 2013	Dec. 31, 2013
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and investments in marketable securities	$ 261,643,000		$ 261,643,000		$ 262,026,000
Indebtedness	158,300,000		158,300,000
Senior secured notes, issued	125,000,000		125,000,000		125,000,000
Restricted cash	25,000,000		25,000,000
Number of business segments			1
Effective income tax rate	34.00%	34.00%	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%		12.00%
Senior secured notes, maturity date			Jul. 15, 2017
Restricted cash	$ 25,000,000		$ 25,000,000