Quarterly report pursuant to sections 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2006
Jan. 31, 2011
Dec. 31, 2008
Dec. 31, 2007
Jun. 30, 2013
Office Equipment [Member]
Dec. 31, 2012
Office Equipment [Member]
Aug. 31, 2010
Leasehold Improvements [Member]
Dec. 31, 2006
Leasehold Improvements [Member]
Jun. 30, 2013
MCG Acquisition [Member]
Contingent Consideration [Member]
Jun. 30, 2012
MCG Acquisition [Member]
Contingent Consideration [Member]
Aug. 31, 2014
Scenario, Forecast [Member]
Leasehold Improvements [Member]
Jun. 30, 2013
General, Administrative and Other Expenses [Member]
Jun. 30, 2012
General, Administrative and Other Expenses [Member]
Jun. 30, 2013
General, Administrative and Other Expenses [Member]
Jun. 30, 2012
General, Administrative and Other Expenses [Member]
Commitments And Contingencies [Line Items]                                            
Operating lease rent expense $ 859 $ 890 $ 1,761 $ 1,755                                    
Sub-lease income 188 211 473 466                                    
Operating lease rent expense, net                                     671 679 1,288 1,289
Lease commencement date     2007-01-01                                      
Lease expires     Sep. 30, 2017                                      
Rent for free periods               Rent free periods of 6 to 9 months                            
Leasehold improvement incentive allowance available               1,538                            
Leasehold improvement incentives received                   39 1,499                      
Leasehold improvement 3,557   3,557   3,557     513     3,284                      
Letters of credit in favor of landlord                           1,013 2,023     506        
Escrow deposit 171   171       452                              
Period of initial deposit of rent in to escrow account             16 months                              
Additional deposits   99   99 339                                  
Loss in sub-lease           150                                
Unamortized liability included in deferred rent 35   35           247                          
Liability reduced by lease payments     42   85                                  
Capital lease obligation                       33 33                  
Contingent consideration percentage of EBITDA                               22.00%            
Number of years contingent consideration adjusted annual EBITDA                               5 years            
Contingent consideration payments                               703 390          
Payments recorded as compensation expense     $ 99