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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Equipment, Deferred Tax Asset, Revenue and Expense Recognition, Equity-Based Compensation and Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 01, 2017
Deferred Tax Asset and Amount Due Pursuant to Tax Receivable Agreement |  |  |  |  |
Percentage of tax benefits payable to partners under tax receivable agreement |  |  | 85.00% |  |
Remaining percentage of cash savings realized by the Company (as a percent) |  |  | 15.00% |  |
Revenue and Expense Recognition |  |  |  |  |
Reimbursable expenses billed to clients | $ 2,708 | $ 4,143 | $ 6,335 | $ 7,394 |
Income Taxes |  |  |  |  |
Unrecognized tax benefits | $ 0 | $ 0 | $ 0 | $ 0 |
ASU 2016-09 | Adjusted | Deferred Tax Assets |  |  |  |  |
Equity-based Compensation |  |  |  |  |
Tax effect of adjustment |  |  |  |  | $ 658
ASU 2016-09 | Adjusted | Retained Earnings (Accumulated Deficit) |  |  |  |  |
Equity-based Compensation |  |  |  |  |
Cumulative effect on retained earnings and APIC |  |  |  |  | (4,855)
Tax effect of adjustment |  |  |  |  | 658
ASU 2016-09 | Adjusted | Additional Paid-In Capital |  |  |  |  |
Equity-based Compensation |  |  |  |  |
Cumulative effect on retained earnings and APIC |  |  |  |  | $ 4,855
Issued Prior to December 1, 2016 |  |  |  |  |
Equity-based Compensation |  |  |  |  |
Minimum age of retiring employees required so that certain qualifying awards granted during employment will not be forfeited |  |  | 54 years |  |
Consecutive years of service of retiring employees required so that certain qualifying awards granted during employment will not be forfeited |  |  | 8 years |  |
Issued On or after December 1, 2016 |  |  |  |  |
Equity-based Compensation |  |  |  |  |
Minimum age of retiring employees required so that certain qualifying awards granted during employment will not be forfeited |  |  | 56 years |  |
Consecutive years of service of retiring employees required so that certain qualifying awards granted during employment will not be forfeited |  |  | 5 years |  |
Minimum total age and consecutive years of service of retiring employees required so that certain qualifying awards granted during employment will not be forfeited |  |  | 65 years |  |
Office equipment and furniture and fixtures | Minimum |  |  |  |  |
Equipment and leasehold improvements, net |  |  |  |  |
Useful lives |  |  | 3 years |  |
Office equipment and furniture and fixtures | Maximum |  |  |  |  |
Equipment and leasehold improvements, net |  |  |  |  |
Useful lives |  |  | 7 years |  |

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