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Acquisitions - Summary of Purchase Price Allocation (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Jan. 13, 2011
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items] |  |
Cash consideration | $ 14,956 | $ 15,044
Escrow cash receivables |  | 88
Additional payment received in cash consideration |  | 384
Fair value obligation of business combination | 0 | 326
Revenue recognized from reversal of contingent liability | 326 |
Restricted units [Member] |  |
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items] |  |
Number of units/shares issued | 559,020 |
Management Employees [Member] |  |
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items] |  |
Cash consideration for Management employees | $ 2,482 |

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