General form of registration statement for all companies including face-amount certificate companies

Stockholders' Equity (Detail) - Assumptions Used in Calculating the Fair Value Black-Scholes Option-Pricing Model

v2.4.0.6
Stockholders' Equity (Detail) - Assumptions Used in Calculating the Fair Value Black-Scholes Option-Pricing Model
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected Volatility 45.20%   44.81%  
Risk free Interest rates     2.36%  
Expected lives (years) 6 years   6 years  
Minimum [Member]
       
Expected Volatility       23.45%
Risk free Interest rates       1.48%
Expected lives (years)       3 years 3 months
Maximum [Member]
       
Expected Volatility       38.28%
Risk free Interest rates       2.43%
Expected lives (years)       5 years 9 months