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Redeemable Non-Controlling Interest (Temporary Equity) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Temporary Equity [Line Items]      
Reclassification of redeemable non-controlling interest to mandatorily redeemable equity interests $ 3,536 $ 6,446  
Contributions to redeemable non-controlling interest   20  
Distribution of mandatory redeemable equity interests   3,723  
Repurchase of redeemable equity interests   2,640  
Promissory notes issued to employees   4,824  
Promissory notes, maturity date   Dec. 21, 2012  
Mandatorily redeemable equity interests   86 3,149
Minimum [Member]
      
Temporary Equity [Line Items]      
Mandatorily redeemable equity interests duration, years   2 years  
Maximum [Member]
      
Temporary Equity [Line Items]      
Mandatorily redeemable equity interests duration, years   5 years  
PrinceRidge [Member]
      
Temporary Equity [Line Items]      
Purchase of non-controlling interest for cash   6,172  
Repurchase of redeemable equity interests   $ 2,640