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Acquisitions - Textual (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Income attributable to fair value adjustments |  |  |  | $ (374,000) | $ (4,819,000) | $ 8,227,000
Share-based Compensation |  | $ 1,534,000 | $ 7,480,000 | 18,416,000 | 24,350,000 | 21,003,000
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  | 17,593,000 |
Goodwill |  |  |  | 37,592,000 | 0 |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | $ (25,550,000) |  | (8,936,000)
Intangible assets amortization period (years) |  |  |  | 7 years |  |
Stock-based compensation expense |  |  |  | $ 7,191,000 | 9,294,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  |  |  | 3,512,000 | 3,273,000 |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  | 34,219,000
Business Combination, Contingent Consideration, Liability |  | 83,695,000 | 122,426,000 | 83,695,000 | 122,426,000 |
Noncontrolling Interest, Increase from Business Combination |  |  |  | 0 | 1,666,000 |
Asset Impairment Charges |  | 56,732,000 |  | 80,057,000 | 4,415,000 | 48,524,000
Goodwill |  | 740,955,000 | 835,935,000 | 740,955,000 | 835,935,000 | $ 844,759,000
Aggregate 2018 Step-up Transaction [Member] [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cost of acquired entity, cash paid |  |  |  | 3,000 |  |
Deferred acquisition consideration |  | $ 4,305 |  | 4,305 |  |
Allison & Partners LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired | 24.50% |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | 10,000 |  |
Cost of acquired entity, cash paid |  |  |  | 0 |  |
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination | $ 20,096 |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | 9,000 |  |
Business Combination, Contingent Consideration, Liability | $ 10,000 |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | $ 1,000 |  |
Aggregate 2017 Step Up Transactions [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Share-based Compensation |  |  |  |  | 996 |
Cost of acquired entity, cash paid |  |  |  |  | 3,858 |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  | 11,965 |
Business Combination, Contingent Consideration, Liability |  |  | 7,208 |  | 7,208 |
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value |  |  |  |  | 816 |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  |  | 397 |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  | 2,315 |
Aggregate 2017 Dispositions [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Share-based Compensation |  |  |  |  | 2,000 |
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  | 17,593 |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  |  | 10,657,000 |
OneChocolate [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  | 100.00% |  | 100.00% |  |
Business Combination, Consideration Transferred |  |  |  | $ 3,231 |  |
Deferred acquisition consideration |  | $ 2,146 |  | 2,146 |  |
Working capital payments |  | $ 966 |  | $ 966 |  |
Instrument [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  | 51.00% |  | 51.00% |  |
Business Combination, Consideration Transferred |  |  |  | $ 35,591 |  |
Cost of acquired entity, cash paid |  |  |  | 29,000 |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | 27,357 |  |
Business Combination, Consideration Transferred, Other |  |  |  | 10,304 |  |
Finite-lived Intangible Assets Acquired |  |  |  | 23,130 |  |
Goodwill |  | $ 32,776 |  | $ 32,776 |  |
Doner [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  | 14.90% |  | 14.90% |  |
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination |  |  |  | $ 16,361 |  |
Kingsdale Partners, LP |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 5,000 |  |
Source [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  | 3.00% |  | 3.00% |  |
Doner and Source [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 7,618 |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | 12,000 |  |
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value |  |  |  | $ 1,000 |  |
Noncontrolling Interest Equity [Domain] | Aggregate 2017 Dispositions [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  |  |  | $ 6,961 |
Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 108,898 | (161,535) | 1,900,000
Redeemable Noncontrolling Interest [Member] | Aggregate 2017 Dispositions [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Redeemable Noncontrolling Interest, Increase from Sale of Equity Interest |  |  |  |  | $ 1,690 |
Additional Paid-in Capital |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | $ (10,140,000) | (2,315,000) | $ (22,776,000)
Stock Issued During Period, Value, Acquisitions |  |  |  | 7,030,000 |  | 34,219,000
Noncontrolling Interest, Increase from Business Combination |  |  |  |  | (5,654,000) |
Noncontrolling Interest [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | (15,410,000) | 11,965,000 | 13,840,000
Noncontrolling Interest, Increase from Business Combination |  |  |  |  | 12,614,000 |
Noncontrolling Interest [Member] | Aggregate 2017 Dispositions [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  |  | 10,657,000 |
Contingent Payment [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Income attributable to fair value adjustments |  | $ 8,979,000 | 18,173,000 | (3,679,000) | (6,021,000) |
Fixed payments [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 1,097,000 | $ 3,340,000 | $ 1,097,000 | 3,340,000 |
Common Class A | Common Stock | Instrument [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 1,011,561 |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | $ 7,030 |  |
Common Class A | Common Stock | Forsman & Bodenfors AB [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | 7,030,000 | $ 0 | $ 34,219,000
Three subsidiaries |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  | $ 1,732,000 |  |

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