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Acquisitions and Dispositions (Details Textual) - USD ($) $ in Thousands |  |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 26, 2021 | Jul. 01, 2020 | Mar. 19, 2020 | Feb. 14, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price for noncontrolling interest |  |  |  |  | $ 20,269 | $ 11,050 |
Deferred acquisition consideration |  |  |  |  | 67,668 |  | $ 83,065
Redeemable noncontrolling interest, redemptions, value |  |  |  |  | 0 |  | $ 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 |  |  |  |  |
Gale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) | 40.00% |  |  |  |  |  |
Aggregate purchase price | $ 20,000 |  |  |  |  |  |
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination | 11,406 |  |  |  |  |  |
Reduction in noncontrolling interests | $ 10,339 |  |  |  |  |  |
KWT Global [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  | 22.50% |  |  |  |
Aggregate purchase price |  |  | $ 2,118 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  | 7,695 |  |  |  |
Closing cash payment |  |  | 729 |  |  |  |
Deferred acquisition consideration |  |  | 1,389 |  |  |  |
Redeemable noncontrolling interest, redemptions, value |  |  |  |  | $ (1,615) |  |
Reduction in noncontrolling interests |  |  | $ 503 |  |  |  |
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 |  |  |

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