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Acquisitions (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 05, 2017 | Jul. 01, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Apr. 01, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Adjustments to deferred acquisition consideration included in share-based compensation |  |  | $ 4,064 | $ 2,259 |  | $ 9,792 | $ 7,184 |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  | (337,000) | (520,000) |  | (9,650,000) |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  | 2,315,000 | 22,498,000 |  |
Stock-based compensation |  |  | 6,380,000 | 5,228,000 |  | 16,870,000 | 15,443,000 |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  |  | 17,593,000 | 764,000 |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  | 18,493,000 | (32,140,000) |  | 19,180,000 | (54,937,000) |  |
Redeemable noncontrolling interests |  |  | $ 60,092,000 |  |  | $ 60,092,000 |  | $ 60,180,000 |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 100.00% |  |  | 100.00% |  |  |
Net Income Loss Including Transfer from Non Controlling Interests |  |  | $ 18,156,000 | (32,660,000) |  | $ 21,495,000 | (32,439,000) |  |
Forsman & Bodenfors AB [Domain] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  | $ 43,535 |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  | 4,460 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 36,698 |  |  |  |  |  |  |
Goodwill, Acquired During Period |  | $ 24,778 |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years 9 months |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value |  | $ 2,275 |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  | 5,514 |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  | 0 |  |  |  |  |  |  |
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Intangible Assets |  | $ 8,074 |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 49,837 |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 15,618 |  |  | $ 3,055 |  |  |  |
Luntz Global Partners L L C |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  | 40.00%
Aggregate 2017 Step Up Transactions [Domain] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  |  |  | 3,858 |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  | (11,965) |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  |  |  | 397 |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  | 2,316 |  |  |
Stock-based compensation |  |  |  |  |  | 996 |  |  |
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value |  |  |  |  |  | 816 |  |  |
Business Combination, Contingent Consideration, Liability |  |  | 7,208 |  |  | 7,208 |  |  |
Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  |  |  |  |  | 1,581 |
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value |  |  |  |  |  |  |  | 1,005 |
Business Combinations, Assets Relinquished by Acquirer |  |  |  |  |  |  |  | 428 |
Business Combinations, Liabilities Relinquished Previously due to Acquiree |  |  |  |  |  |  |  | 94 |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  | (11,965,000) |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  | 0 |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  | 2,315,000 |  |  |
Additional Paid-in Capital [Member] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  | (22,775) |
Contingent payment [Domain] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | $ (2,462,000) | $ 11,152,000 |  | $ 12,152,000 | $ 17,180,000 |  |
Contingent payment [Domain] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Deferred Stock-based Compensation, Discounted |  |  |  |  |  |  |  | 2,393 |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | 4,052,000 |
Fixed payments [Member] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | 467 |
Noncontrolling Interest Equity [Domain] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  | $ (19,354) |
Common Class A [Member] | Common Stock [Member] | Forsman & Bodenfors AB [Domain] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 2,450,000 | 1,900,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 20,800 | $ 34,219,000 |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The amount of the valuation allowance recorded in a business combination against deductible temporary differences for which related tax benefits will be recorded as a reduction of the acquired entity's other noncurrent intangible assets if those tax benefits subsequently become realizable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 740 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77909562&loc=d3e9901-128506 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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