v2.4.0.6
Senior Secured Revolving Credit Facility (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
May 17, 2012
Senior Secured Revolving Credit Facility [Abstract]      
Senior secured revolving credit facility maximum capacity $ 100,000   $ 100,000
Minimum consolidated shareholders' equity 3,600,000    
Quarterly Increases % of Positive Net Income 25.00%    
Maximum debt to capitalization ratio 30.00%    
Minimum liquidity ratio
minimum liquidity ratio of 1.0 to 1.0
   
Maximum debt to net regulatory capital ratio 35.00%    
Outstanding debt under credit facility $ 0 $ 0