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Changes in Stock Appreciation Rights (Detail) (SARs, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
SARs
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
SAR's Granted 260,125 275,625 1,506,940
SARs, Exercised 54,873 [1] 100,119 [1] 1,440,488 [1]
SARs, Forfeited 1,598   64,937
SAR, Cancelled 12.795    
Weighted Average Base Price, Granted $ 9.25 $ 12.15 $ 7.11
Weighted Average Base Price, Exercised $ 7.89 [1] $ 9.74 [1] $ 7.52 [1]
Weighted Average Base Price, Forfeited $ 10.54   $ 9.24
Weighted Average Base Price, Cancelled $ 6.70    
Weighted Average Fair Value, Granted $ 4.90 $ 6.58 $ 4.14
Weighted Average Fair Value, Exercised $ 4.65 [1] $ 5.82 [1] $ 4.53 [1]
Weighted Average Fair Value, Forfeited $ 5.83   $ 5.11
Weighted Average Fair Value, Cancelled $ 3.93    
[1] The exercise of those SARs resulted in the issuance of 9,818 , 20,229 and 372,499 shares of ICG's Common Stock during the years ended December 31, 2012, 2011 and 2010, respectively.