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Acquisitions and Dispositions (Details Textual) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2020 | Feb. 14, 2020 | Nov. 15, 2019 | Apr. 01, 2019 | Mar. 08, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  | $ 39,252 |  | $ 75,220
Redeemable noncontrolling interest, redemptions, value |  |  |  |  |  |  |  |  | $ (14,530)
Business acquisitions and step-up transactions, net of tax |  |  |  |  |  | $ (97) |  | $ (97) |
KWT Global [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) | 22.50% |  |  |  |  |  |  |  |
Aggregate purchase price | $ 2,118 |  |  |  |  |  |  |  |
Closing cash payment | 729 |  |  |  |  |  |  |  |
Deferred acquisition consideration | 1,389 |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, redemptions, value |  |  |  |  |  |  | $ (1,615) |  |
Reduction in noncontrolling interests | $ 503 |  |  |  |  |  |  |  |
Laird - Partners [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  | 35.00% |  |  |  |  |  |
Aggregate purchase price |  |  | $ 2,389 |  |  |  |  |  |
Closing cash payment |  |  | 1,588 |  |  |  |  |  |
Deferred acquisition consideration |  |  | 801 |  |  |  |  |  |
Business acquisitions and step-up transactions, net of tax |  |  | (5,045) |  |  |  |  |  |
Reduction in noncontrolling interests |  |  | $ 2,656 |  |  |  |  |  |
Hunter PR LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  | 35.00% |  |  |  |  |
Aggregate purchase price |  |  |  | $ 10,234 |  |  |  |  |
Closing cash payment |  |  |  | 3,890 |  |  |  |  |
Deferred acquisition consideration |  |  |  | 6,344 |  |  |  |  |
Business acquisitions and step-up transactions, net of tax |  |  |  | (9,486) |  |  |  |  |
Reduction in noncontrolling interests |  |  |  | $ 745 |  |  |  |  |
Sloane and Company LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 26,696 |  |  |  |  |  |  |
Gain (loss) on disposition of business |  | $ 16,827 |  |  |  |  |  |  |
Kingsdale Partners LP [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  | $ 50,000 |  |  |  |
Gain (loss) on disposition of business |  |  |  |  | $ 3,000 |  |  |  |

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