Quarterly report pursuant to Section 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 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Mcg Acquisition
Contingent Consideration
Sep. 30, 2013
Mcg Acquisition
Contingent Consideration
Sep. 30, 2014
Additional Office Space
Sep. 30, 2014
Office Equipment
Dec. 31, 2013
Office Equipment
Sep. 30, 2014
New York City leases
Sep. 30, 2014
Boston landlord
Aug. 31, 2014
Leasehold Improvements
Aug. 31, 2010
Leasehold Improvements
Dec. 31, 2006
Leasehold Improvements
Sep. 30, 2014
General, Administrative and Other Expenses
Sep. 30, 2013
General, Administrative and Other Expenses
Sep. 30, 2014
General, Administrative and Other Expenses
Sep. 30, 2013
General, Administrative and Other Expenses
Commitments And Contingencies [Line Items]                                    
Operating lease rent expense $ 938 $ 893 $ 2,736 $ 2,654                            
Sub-lease income 91 180 287 653                            
Operating lease rent expense, net             5               847 713 2,449 2,001
Letters of credit in favor of landlord                     80 586 1,013 2,023        
Reduction in letter of credit                   (80)                
Refundable security deposit             3                      
Lease commencement date             2014-05-01                      
Lease expires             Jul. 31, 2019 Nov. 30, 2018                    
Rent for free periods             rent-free period of three months                      
Capital lease obligation               301 19                  
Asset acquired under capital lease     321         321                    
Capital lease, period               5 years                    
Capital lease, minimum monthly payment               5                    
Contingent consideration percentage of EBITDA         22.00%                          
Number of years contingent consideration adjusted annual EBITDA         5 years                          
Contingent consideration payments         1,679 703                        
Payments recorded as compensation expense     $ 0 $ 139