Acquisitions and Dispositions	9 Months Ended
Sep. 30, 2018
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions 2018 Acquisitions On September 7, 2018, a subsidiary of the Company purchased 100% interests of OneChocolate Communications Limited and OneChocolate Communications LLC, PR (“OneChocolate”) a digital marketing consultancy headquartered in London, UK, for an aggregate purchase price of $3,231 (subject to a working capital adjustment) and additional deferred acquisition payments estimated to be a nominal amount. OneChocolate’s results are reflected in the Allison & Partners operating segment which is included in the Specialist Communications reportable segment which had an immaterial impact on our results. On July 1, 2018, the Company acquired the remaining 14.87% and 3% of membership interests of Doner Partners, LLC and Source Marketing LLC respectively for an aggregate purchase price of $7,618, comprised of a closing cash payment of $3,279 and additional payments to be made on or before April 2020. As a result of the transaction, the Company reduced noncontrolling interest by $11,946 and redeemable noncontrolling interest by $933. On April 2, 2018, the Company purchased 51% of the membership interests of Instrument LLC (“Instrument”), a digital creative agency based in Portland, Oregon, for an aggregate estimated purchase price of $35,591. The acquisition is expected to facilitate the Company’s growth and help to build its portfolio of modern, innovative and digital-first agencies. The purchase price consisted of a cash payment of $28,561 and the issuance of 1,011,561 shares of the Company’s Class A subordinate voting stock with an acquisition date fair value of $7,030. The Company issued these shares in a transaction exempt from the registration requirements of the Securities Act of 1933, as amended, pursuant to Section 4(a)(2) of the Securities Act. The preliminary purchase price allocation for Instrument resulted in tangible assets of $10,304, identifiable intangibles of $23,130, consisting primarily of customer lists and a trade name, and goodwill of $29,514. In addition, the Company has recorded $27,357 as the fair value of noncontrolling interests, which was derived from the Company’s purchase price less a discount related to the noncontrolling parties’ lack of control. The identified assets have a weighted average useful life of approximately six years and will be amortized in a manner represented by the pattern in which the economic benefits of such assets are expected to be realized. The goodwill is tax deductible. Instruments’ results are included in the All Other category from a segment reporting perspective. The Company has a controlling financial interest in Instrument through its majority voting interest, and as such, has aggregated the acquired Partner Firm’s financial data into the Company’s consolidated financial statements. The operating results of Instrument in the current and prior year are not material. Effective January 1, 2018, the Company acquired the remaining 24.5% ownership interest of Allison & Partners LLC for an aggregate purchase price of $10,023, comprised of a closing cash payment of $300 and additional deferred acquisition payments with an estimated present value at the acquisition date of $9,723. The deferred payments are based on the future financial results of the underlying business from 2017 to 2020 with final payments due in 2021. As a result of the transaction, the Company reduced redeemable noncontrolling interests by $8,857. The difference between the purchase price and the noncontrolling interest of $1,166 was recorded in additional paid-in capital. 2017 Acquisitions In 2017, the Company entered into various non-material transactions in connection with certain of its majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $3,352, increased fixed deferred consideration liability by $7,208, reduced redeemable noncontrolling interests by $269, reduced noncontrolling interests by $11,947, and increased additional paid-in capital by $2,652. In addition, a stock-based compensation charge of $997 has been recognized representing the consideration paid in excess of the fair value of the interest acquired. 2017 Dispositions In 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. The net assets reflected in the calculation of the net loss on sale was inclusive of goodwill of $17,593. Goodwill was allocated to subsidiaries based on relative fair value of the sold subsidiaries compared to the fair value of the respective reporting units. Additionally, the Company recorded a reduction in noncontrolling interests of $10,657. The Company expenses acquisition related costs as incurred. For the three and nine months ended September 30, 2018 and 2017, $232 and $943, respectively, and $216 and $693 respectively, of acquisition related costs were charged to operations.

Acquisitions and Dispositions

2018 Acquisitions

On September 7, 2018, a subsidiary of the Company purchased 100% interests of OneChocolate Communications Limited and OneChocolate Communications LLC, PR (“OneChocolate”) a digital marketing consultancy headquartered in London, UK, for an aggregate purchase price of $3,231 (subject to a working capital adjustment) and additional deferred acquisition payments estimated to be a nominal amount. OneChocolate’s results are reflected in the Allison & Partners operating segment which is included in the Specialist Communications reportable segment which had an immaterial impact on our results.

On July 1, 2018, the Company acquired the remaining 14.87% and 3% of membership interests of Doner Partners, LLC and Source Marketing LLC respectively for an aggregate purchase price of $7,618, comprised of a closing cash payment of $3,279 and additional payments to be made on or before April 2020. As a result of the transaction, the Company reduced noncontrolling interest by $11,946 and redeemable noncontrolling interest by $933.

On April 2, 2018, the Company purchased 51% of the membership interests of Instrument LLC (“Instrument”), a digital creative agency based in Portland, Oregon, for an aggregate estimated purchase price of $35,591. The acquisition is expected to facilitate the Company’s growth and help to build its portfolio of modern, innovative and digital-first agencies. The purchase price consisted of a cash payment of $28,561 and the issuance of 1,011,561 shares of the Company’s Class A subordinate voting stock with an acquisition date fair value of $7,030. The Company issued these shares in a transaction exempt from the registration requirements of the Securities Act of 1933, as amended, pursuant to Section 4(a)(2) of the Securities Act.

The preliminary purchase price allocation for Instrument resulted in tangible assets of $10,304, identifiable intangibles of $23,130, consisting primarily of customer lists and a trade name, and goodwill of $29,514. In addition, the Company has recorded $27,357 as the fair value of noncontrolling interests, which was derived from the Company’s purchase price less a discount related to the noncontrolling parties’ lack of control. The identified assets have a weighted average useful life of approximately six years and will be amortized in a manner represented by the pattern in which the economic benefits of such assets are expected to be realized. The goodwill is tax deductible. Instruments’ results are included in the All Other category from a segment reporting perspective. The Company has a controlling financial interest in Instrument through its majority voting interest, and as such, has aggregated the acquired Partner Firm’s financial data into the Company’s consolidated financial statements. The operating results of Instrument in the current and prior year are not material.

Effective January 1, 2018, the Company acquired the remaining 24.5% ownership interest of Allison & Partners LLC for an aggregate purchase price of $10,023, comprised of a closing cash payment of $300 and additional deferred acquisition payments with an estimated present value at the acquisition date of $9,723. The deferred payments are based on the future financial results of the underlying business from 2017 to 2020 with final payments due in 2021. As a result of the transaction, the Company reduced redeemable noncontrolling interests by $8,857. The difference between the purchase price and the noncontrolling interest of $1,166 was recorded in additional paid-in capital.

2017 Acquisitions

In 2017, the Company entered into various non-material transactions in connection with certain of its majority-owned entities. As a result of the foregoing, the Company made total cash closing payments of $3,352, increased fixed deferred consideration liability by $7,208, reduced redeemable noncontrolling interests by $269, reduced noncontrolling interests by $11,947, and increased additional paid-in capital by $2,652. In addition, a stock-based compensation charge of $997 has been recognized representing the consideration paid in excess of the fair value of the interest acquired.

2017 Dispositions

In 2017, the Company sold all of its ownership interests in three subsidiaries resulting in recognition of a net loss on sale of business of $1,424. The net assets reflected in the calculation of the net loss on sale was inclusive of goodwill of $17,593. Goodwill was allocated to subsidiaries based on relative fair value of the sold subsidiaries compared to the fair value of the respective reporting units. Additionally, the Company recorded a reduction in noncontrolling interests of $10,657.

The Company expenses acquisition related costs as incurred. For the three and nine months ended September 30, 2018 and 2017, $232 and $943, respectively, and $216 and $693 respectively, of acquisition related costs were charged to operations.