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Organization - Additional Information (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) office | Dec. 31, 2017 USD ($)
Organization And Basis Of Presentation [Line Items] |  |
Ownership interest in subsidiary | 83.68% |
Non-controlling interest | $ | $ 365,000 | $ 361,000
Americas |  |
Organization And Basis Of Presentation [Line Items] |  |
Number of offices providing services | office | 92 |

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