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Note 3 - Acquisitions (Details Textual) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 05, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Number of Businesses Acquired |  | 12 | 10
Business Combination, Acquisition Related Costs |  | $ 11,747 | $ 6,247
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  | 379,486 | 17,531
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 196,480 |
Finland Residential Property Management Business [Member] |  |  |
Disposal Group, Including Discontinued Operation, Assets, Total |  | 17,713 |
Gain (Loss) on Disposition of Business |  | 98 |
Harrison Street Real Estate Capital [Member] |  |  |
Number of Businesses Acquired | 1 |  |
Business Acquisition, Percentage of Voting Interests Acquired | 75.00% |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 61,465 |
Acquisitions after December 31, 2008 [Member] |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | 93,865 |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low |  | 175,870 |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 206,906 |
Contingent Consideration Paid |  | 19,946 | $ 11,187
Acquisitions after December 31, 2008 [Member] | Contingent Consideration, Compensation Element [Member] |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | 15,161 |
Finland Residential Property Management Business [Member] |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 45,364 |
Other Acquisitions [Member] |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | $ 89,651 |
Americas [Member] |  |  |
Number of Businesses Acquired |  | 5 |
EMEA [Member] |  |  |
Number of Businesses Acquired |  | 4 |
Asia Pacific [Member] |  |  |
Number of Businesses Acquired |  | 2 |

X
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e1107-107759 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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