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 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Mcg Acquisition
Contingent Consideration
Jun. 30, 2013
Mcg Acquisition
Contingent Consideration
Jun. 30, 2014
Additional Office Space
Jun. 30, 2014
Office Equipment
Dec. 31, 2013
Office Equipment
Aug. 31, 2010
Leasehold Improvements
Dec. 31, 2006
Leasehold Improvements
Aug. 31, 2014
Leasehold Improvements
Scenario, Forecast
Jun. 30, 2014
General, Administrative and Other Expenses
Jun. 30, 2013
General, Administrative and Other Expenses
Jun. 30, 2014
General, Administrative and Other Expenses
Jun. 30, 2013
General, Administrative and Other Expenses
Commitments And Contingencies [Line Items]                                
Operating lease rent expense $ 897 $ 859 $ 1,798 $ 1,761                        
Sub-lease income 95 188 196 473                        
Operating lease rent expense, net             5           802 671 1,602 1,288
Letters of credit in favor of landlord                   1,013 2,023 506        
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               239 19              
Asset acquired under capital lease     289         289                
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 $ 99