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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 |

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