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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2006
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Jun. 30, 2012
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Dec. 31, 2008
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Dec. 31, 2007
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Sep. 30, 2013
MCG Acquisition
Contingent Consideration
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Sep. 30, 2012
MCG Acquisition
Contingent Consideration
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Sep. 30, 2013
Office Equipment
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Dec. 31, 2012
Office Equipment
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Aug. 31, 2010
Leasehold Improvements
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Dec. 31, 2006
Leasehold Improvements
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Aug. 31, 2014
Scenario, Forecast
Leasehold Improvements
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Sep. 30, 2013
General, Administrative and Other Expenses
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Sep. 30, 2012
General, Administrative and Other Expenses
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Sep. 30, 2013
General, Administrative and Other Expenses
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Sep. 30, 2012
General, Administrative and Other Expenses
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| Commitments And Contingencies [Line Items] | ||||||||||||||||||||||
| Operating lease rent expense | $ 893 | $ 962 | $ 2,654 | $ 2,717 | ||||||||||||||||||
| Sub-lease income | 180 | 181 | 653 | 647 | ||||||||||||||||||
| Operating lease rent expense, net | 713 | 781 | 2,001 | 2,070 | ||||||||||||||||||
| 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 improvements | 3,559 | 3,559 | 3,557 | 513 | 3,284 | |||||||||||||||||
| Letters of credit in favor of landlord | 1,013 | 2,023 | 506 | |||||||||||||||||||
| Escrow deposit | 57 | 57 | 452 | |||||||||||||||||||
| Period of initial deposit of rent in to escrow account | 16 months | |||||||||||||||||||||
| Additional deposits | 339 | 99 | ||||||||||||||||||||
| Loss in sub-lease | 150 | |||||||||||||||||||||
| Unamortized liability included in deferred rent | 14 | 14 | 247 | |||||||||||||||||||
| Liability reduced by lease payments | 63 | 85 | 85 | |||||||||||||||||||
| Capital lease obligation | 19 | 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 | $ 20 | $ 139 | ||||||||||||||||||||