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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