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Equity-Based Compensation (Details 2) (SARs [Member])	3 Months Ended		9 Months Ended
Equity-Based Compensation (Details 2) (SARs [Member])	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of assumptions used to determine the fair value of SARs granted to employees and a non-management director by ICG
Expected volatility	56.00%	56.00%	56.00%	56.00%
Average expected life of SAR (in years)	6 years 3 months		6 years 3 months
Risk-free interest rate, minimum		1.62%		1.62%
Risk-free interest rate, maximum	0.92%	1.97%	0.92%	1.97%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum [Member]
Summary of assumptions used to determine the fair value of SARs granted to employees and a non-management director by ICG
Average expected life of SAR (in years)		5 years 3 months		5 years 3 months
Maximum [Member]
Summary of assumptions used to determine the fair value of SARs granted to employees and a non-management director by ICG
Average expected life of SAR (in years)		6 years 3 months		6 years 3 months

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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