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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassification (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Item Effected [Line Items] |  |
Revenues | $ 324,651 | $ 264,482
Reimbursable expenses and other revenues |  |
Item Effected [Line Items] |  |
Revenues | 3,925 | 2,446
United States |  |
Item Effected [Line Items] |  |
Revenues | 176,830 | 136,639
United Kingdom |  |
Item Effected [Line Items] |  |
Revenues | 46,594 | 43,560
Switzerland |  |
Item Effected [Line Items] |  |
Revenues | 29,096 | 30,852
Canada |  |
Item Effected [Line Items] |  |
Revenues | 12,494 | 15,846
Russia |  |
Item Effected [Line Items] |  |
Revenues | 13,209 | 8,965
Germany |  |
Item Effected [Line Items] |  |
Revenues | 12,094 | 8,739
Hong Kong |  |
Item Effected [Line Items] |  |
Revenues | 4,777 | 5,944
Sweden |  |
Item Effected [Line Items] |  |
Revenues | 7,466 | 4,128
Netherlands |  |
Item Effected [Line Items] |  |
Revenues | 8,671 | 2,647
Ireland |  |
Item Effected [Line Items] |  |
Revenues | 1,389 | 1,186
Italy |  |
Item Effected [Line Items] |  |
Revenues | 1,280 | 668
Denmark |  |
Item Effected [Line Items] |  |
Revenues | 1,253 | 410
China |  |
Item Effected [Line Items] |  |
Revenues | 1,584 | 294
Other locations |  |
Item Effected [Line Items] |  |
Revenues | $ 5,866 | 4,604
Previously reported |  |
Item Effected [Line Items] |  |
Revenues |  | $ 264,482
Percent of Revenue |  | 100.00%
Previously reported | Reimbursable expenses and other revenues |  |
Item Effected [Line Items] |  |
Revenues |  | $ 2,446
Percent of Revenue |  | 0.90%
Previously reported | United States |  |
Item Effected [Line Items] |  |
Revenues |  | $ 135,558
Percent of Revenue |  | 51.30%
Previously reported | United Kingdom |  |
Item Effected [Line Items] |  |
Revenues |  | $ 42,990
Percent of Revenue |  | 16.30%
Previously reported | Switzerland |  |
Item Effected [Line Items] |  |
Revenues |  | $ 30,765
Percent of Revenue |  | 11.60%
Previously reported | Canada |  |
Item Effected [Line Items] |  |
Revenues |  | $ 15,701
Percent of Revenue |  | 5.90%
Previously reported | Russia |  |
Item Effected [Line Items] |  |
Revenues |  | $ 8,952
Percent of Revenue |  | 3.40%
Previously reported | Germany |  |
Item Effected [Line Items] |  |
Revenues |  | $ 8,706
Percent of Revenue |  | 3.30%
Previously reported | Hong Kong |  |
Item Effected [Line Items] |  |
Revenues |  | $ 5,754
Percent of Revenue |  | 2.20%
Previously reported | Sweden |  |
Item Effected [Line Items] |  |
Revenues |  | $ 4,060
Percent of Revenue |  | 1.50%
Previously reported | Netherlands |  |
Item Effected [Line Items] |  |
Revenues |  | $ 2,547
Percent of Revenue |  | 1.00%
Previously reported | Ireland |  |
Item Effected [Line Items] |  |
Revenues |  | $ 1,184
Percent of Revenue |  | 0.40%
Previously reported | Italy |  |
Item Effected [Line Items] |  |
Revenues |  | $ 636
Percent of Revenue |  | 0.20%
Previously reported | Denmark |  |
Item Effected [Line Items] |  |
Revenues |  | $ 405
Percent of Revenue |  | 0.20%
Previously reported | China |  |
Item Effected [Line Items] |  |
Revenues |  | $ 294
Percent of Revenue |  | 0.10%
Previously reported | Other locations |  |
Item Effected [Line Items] |  |
Revenues |  | $ 4,484
Percent of Revenue |  | 1.70%
After reclassification adjustment |  |
Item Effected [Line Items] |  |
Revenues |  | $ 264,482
Percent of Revenue |  | 100.00%
After reclassification adjustment | Reimbursable expenses and other revenues |  |
Item Effected [Line Items] |  |
Revenues |  | $ 0
Percent of Revenue |  | 0.00%
After reclassification adjustment | United States |  |
Item Effected [Line Items] |  |
Revenues |  | $ 136,639
Percent of Revenue |  | 51.70%
After reclassification adjustment | United Kingdom |  |
Item Effected [Line Items] |  |
Revenues |  | $ 43,560
Percent of Revenue |  | 16.50%
After reclassification adjustment | Switzerland |  |
Item Effected [Line Items] |  |
Revenues |  | $ 30,852
Percent of Revenue |  | 11.70%
After reclassification adjustment | Canada |  |
Item Effected [Line Items] |  |
Revenues |  | $ 15,846
Percent of Revenue |  | 6.00%
After reclassification adjustment | Russia |  |
Item Effected [Line Items] |  |
Revenues |  | $ 8,965
Percent of Revenue |  | 3.40%
After reclassification adjustment | Germany |  |
Item Effected [Line Items] |  |
Revenues |  | $ 8,739
Percent of Revenue |  | 3.30%
After reclassification adjustment | Hong Kong |  |
Item Effected [Line Items] |  |
Revenues |  | $ 5,944
Percent of Revenue |  | 2.20%
After reclassification adjustment | Sweden |  |
Item Effected [Line Items] |  |
Revenues |  | $ 4,128
Percent of Revenue |  | 1.50%
After reclassification adjustment | Netherlands |  |
Item Effected [Line Items] |  |
Revenues |  | $ 2,647
Percent of Revenue |  | 1.00%
After reclassification adjustment | Ireland |  |
Item Effected [Line Items] |  |
Revenues |  | $ 1,186
Percent of Revenue |  | 0.40%
After reclassification adjustment | Italy |  |
Item Effected [Line Items] |  |
Revenues |  | $ 668
Percent of Revenue |  | 0.30%
After reclassification adjustment | Denmark |  |
Item Effected [Line Items] |  |
Revenues |  | $ 410
Percent of Revenue |  | 0.20%
After reclassification adjustment | China |  |
Item Effected [Line Items] |  |
Revenues |  | $ 294
Percent of Revenue |  | 0.10%
After reclassification adjustment | Other locations |  |
Item Effected [Line Items] |  |
Revenues |  | $ 4,604
Percent of Revenue |  | 1.70%

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