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Acquisitions and Dispositions (Details Textual) - USD ($) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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Jul. 01, 2020 | Mar. 19, 2020 | Feb. 14, 2020 | Nov. 15, 2019 | Apr. 01, 2019 | Mar. 08, 2019 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for noncontrolling interest |  |  |  |  |  |  | $ 11,392 |  | $ 14,499 |  |
Reduction of noncontrolling and redeemable noncontrolling interest |  |  |  |  |  |  |  | $ 648 |  | $ 745 |
Deferred acquisition consideration |  |  |  |  |  |  |  |  | 46,145 |  | $ 75,220
Redeemable noncontrolling interest, redemptions, value |  |  |  |  |  |  | $ (14,530) |  | (12,289) |  |
Veritas [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired | 10.00% |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for noncontrolling interest | $ 2,187 |  |  |  |  |  |  |  |  |  |
Deferred cash payment for noncontrolling interest | 1,087 |  |  |  |  |  |  |  |  |  |
Reduction of noncontrolling and redeemable noncontrolling interest | 2,651 |  |  |  |  |  |  |  |  |  |
Difference between purchase price and noncontrolling interest recorded in common stock and other paid-in capital | $ 464 |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Reduction of noncontrolling and redeemable noncontrolling interest |  |  |  | $ 5,045 |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  | 35.00% |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 2,389 |  |  |  |  |  |  |
Closing cash payment |  |  |  | 1,588 |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  | 801 |  |  |  |  |  |  |
Reduction in noncontrolling interests |  |  |  | $ 2,656 |  |  |  |  |  |  |
Hunter PR LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction of noncontrolling and redeemable noncontrolling interest |  |  |  |  | $ 9,486 |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  |  | 35.00% |  |  |  |  |  |
Aggregate purchase price |  |  |  |  | $ 10,234 |  |  |  |  |  |
Closing cash payment |  |  |  |  | 3,890 |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  | 6,344 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Sloane and Company LLC [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of contingent payments expected after disposal |  |  | 2 years |  |  |  |  |  |  |  |
Kingsdale Partners LP [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  | $ 50 |  |  |  |  |
Gain (loss) on disposition of business |  |  |  |  |  | $ 3 |  |  |  |  |

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