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Significant Accounting Policies - Textual (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 01, 2017 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Clients shares | Dec. 31, 2018 USD ($) reportable_segment | Dec. 31, 2017 USD ($) Clients reportable_segment shares | Dec. 31, 2016 USD ($) Clients reportable_segment $ / shares shares | Dec. 31, 2015 Clients $ / shares shares | May 03, 2016 USD ($) | Mar. 23, 2016 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 20, 2013
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash held in trusts |  | $ 0 | $ 4,632,000 | $ 0 | $ 4,632,000 |  |  |  |  |  |  |
Accretion on Convertible Preferred Shares |  |  |  | (8,355,000) | 6,352,000 | $ 0 |  |  |  |  |  |
Earnings Per Share, Increase (Decrease) Due To Non-Controlling Dividend As A Result Of Redeemable Redemption Value In Excess of Fair Value | $ / shares |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |
Long-Term Growth Rate Assumed in Annual Goodwill Impairment Test | 3.00% |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  | $ 14,036,000 | $ 17,587,000 | 14,036,000 | 17,587,000 |  |  |  |  |  |  |
Income attributable to fair value adjustments |  |  |  | $ (374,000) | $ (4,819,000) | $ 8,227,000 |  |  |  |  |  |
Clients exceeding consolidated accounts receivable percentage | Clients |  |  | 0 |  | 0 | 0 |  |  |  |  |  |
Number of Reporting Units | reportable_segment |  |  |  | 3 | 2 | 3 |  |  |  |  |  |
Consolidated accounts receivable percentage |  | 10.00% |  | 10.00% |  | 10.00% |  |  |  |  |  |
Clients exceeding consolidated largest client revenue | Clients |  |  |  |  |  | 0 | 0 |  |  |  |  |
Consolidated largest client revenue |  |  |  | 10.00% |  | 10.00% | 10.00% |  |  |  |  |
Distributions from non-consolidated affiliates |  |  |  | $ 963,000 | $ 3,672,000 | $ 7,402,000 |  |  |  |  |  |
Cost method investments |  | $ 8,072,000 | $ 9,527,000 | 8,072,000 | 9,527,000 |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 74,560,000 | 3,238,000 |  |  |  |  |  |  |
Assets |  | 1,611,573,000 | 1,698,892,000 | 1,611,573,000 | 1,698,892,000 |  |  |  |  |  |  |
Liabilities |  | $ 1,806,994,000 | 1,791,519,000 | 1,806,994,000 | 1,791,519,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  |  | 0 | 0 |  |  |  |  |
Stock-based compensation |  |  |  | 5,892,000 | 5,335,000 | $ 5,808,000 |  |  |  |  |  |
Pension expense |  |  |  | $ 9,810,000 | $ 10,124,000 | 10,026,000 |  |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate |  |  |  | 1.70% |  |  |  |  |  |  |  |
Expected volatility rate |  |  |  | 46.20% |  |  |  |  |  |  |  |
Expected term |  |  |  | 4 years |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 3 years |  |  |  |  |  |  |
Weighted Average Cost Of Capital, Annual Goodwill Impairment Test | 9.67% |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 7 years |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  |
Weighted Average Cost Of Capital, Annual Goodwill Impairment Test | 11.85% |  |  |  |  |  |  |  |  |  |  |
Contingent Payment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to fair value adjustments |  | $ 8,979,000 | $ 18,173,000 | $ (3,679,000) | $ (6,021,000) |  |  |  |  |  |  |
Six Point Five Zero Percentage Notes [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.50% |  | 6.50% |  |  |  |  | 6.50% |  |  |
Six Point Seven Five Percentage Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 6.75% | 6.75% | 6.75%
Interest Expense [Member] | Fixed Payment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to fair value adjustments |  |  |  | $ 87,000 | 100,000 | $ 255,000 |  |  |  |  |  |
Quantitative Assessment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Reporting Units |  |  |  |  |  | 13 |  |  |  |  |  |
Specialist Communications [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 0 | 0 |  |  |  |  |  |  |
All Other [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 4,691,000 | 0 |  |  |  |  |  |  |
Domestic Creative Agencies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 0 | 0 |  |  |  |  |  |  |
Wells Fargo Capital Finance, Llc [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 325,000,000 |  |  |  |
Assets and liabilities held for sale |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash held in trusts |  | $ 4,000 |  | 4,000 |  |  |  |  |  |  |  |
Convertible Preference Shares | Convertible preference shares |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accretion on Convertible Preferred Shares |  |  |  | $ (8,355,000) | $ (36,254,000) |  |  |  |  |  |  |
Shares authorized | shares |  |  | 95,000 |  | 95,000 |  |  |  |  |  |  |
Shares issued | shares |  |  | 95,000 |  | 95,000 |  |  |  |  |  |  |

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