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Fair Value Measurement (Detail) - (Table) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period | 324,352 | 231,837 |  |  |  |
Business Acquisition, Contingent Consideration, Actual Cash Payment | $ 7,000 | $ 3,000 |  | $ 5,000 | $ 3,000 |
Changes in fair value on contingent liability | 0 | 832,000 |  |  |  |
Assets: |  |  |  |  |  |
Available-for-sale Securities, Current | 54,669,000 | 45,682,000 | $ 64,027,000 |  |  |
Notes Receivable, Related Parties, Noncurrent | 2,199,000 | 2,555,000 | 2,289,000 |  |  |
Available-for-sale Securities, Noncurrent | 20,507,000 | 53,298,000 | 29,523,000 |  |  |
Contingent payment liability |  | 20,617,000 | 20,617,000 |  |  | $ 10,000,000
business combinations contingent liability payment |  |  | 7,359,000 |  |  |
Liabilities: |  |  |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 201,000 |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Loss | $ 118,000 | 208,000 |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain |  | $ 1,000 |  |  |  |
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share | $ 36.60 | $ 32.65 |  |  |  |
Repayment of Notes Receivable from Related Parties | $ (102,000) | $ (103,000) |  |  |  |
Increase (Decrease) in Accrued Interest Receivable, Net | 12,000 | 14,000 |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (7,000,000) | 0 | (11,206,000) |  |  |
Fair Value [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash Equivalents | 50,496,000 |  | 58,436,000 |  |  |
Current marketable securities – available for sale |  |  | 64,027,000 |  |  |
Long-term marketable securities – available for sale |  |  | 29,523,000 |  |  |
Total assets | 125,873,000 |  | 151,986,000 |  |  |
Contingent payment liability | 3,000,000 |  | 10,000,000 | $ 7,948,000 |  |
Liabilities: |  |  |  |  |  |
Total liabilities | 3,000,000 |  | 10,783,000 |  |  |
Fair Value [Member] | Forward contracts [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure |  |  | 783,000 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash Equivalents | 50,496,000 |  | 58,436,000 |  |  |
Current marketable securities – available for sale | 54,669,000 |  | 64,027,000 |  |  |
Long-term marketable securities – available for sale | 20,507,000 |  | 29,523,000 |  |  |
Total assets | 125,672,000 |  | 151,986,000 |  |  |
Contingent payment liability | 0 |  | 0 |  |  |
Liabilities: |  |  |  |  |  |
Total liabilities | 0 |  | 0 |  |  |
Fair Value, Inputs, Level 1 [Member] | Forward contracts [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure |  |  | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash Equivalents | 0 |  | 0 |  |  |
Current marketable securities – available for sale | 0 |  | 0 |  |  |
Long-term marketable securities – available for sale | 0 |  | 0 |  |  |
Total assets | 201,000 |  | 0 |  |  |
Contingent payment liability | 0 |  | 0 |  |  |
Liabilities: |  |  |  |  |  |
Total liabilities | 0 |  | 783,000 |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 201,000 |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure |  |  | 783,000 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash Equivalents | 0 |  | 0 |  |  |
Current marketable securities – available for sale | 0 |  | 0 |  |  |
Long-term marketable securities – available for sale | 0 |  | 0 |  |  |
Total assets | 0 |  | 0 |  |  |
Contingent payment liability | 3,000,000 |  | 10,000,000 |  |  |
Liabilities: |  |  |  |  |  |
Total liabilities | $ 3,000,000 |  | 10,000,000 |  |  |
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure |  |  | 0 |  |  |
Other Long-term Investments [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Loss |  | 45,000 |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain |  | $ 109,000 |  |  |  |
Changes Measurement [Member] |  |  |  |  |  |
Liabilities: |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | $ (11,206,000) |  |  |

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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