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Acquisitions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) entity | Dec. 31, 2014 USD ($) item
Acquisitions And Strategic Investments [Line Items] |  |  |
Acquisition of a business, net of cash acquired | $ 1,964 | $ 10,302 | $ 25,115
Number of businesses acquired | item |  |  | 7
Business Combinations, goodwill | 1,720 | $ 5,047 | $ 13,077
Business Combination, Consideration Transferred |  |  | 24,900
Proceeds from sale of equity investment |  |  | 5,400
Reference Laboratory Diagnostic And Consulting Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Acquisition of a business, net of cash acquired | $ 3,500 |  |
Number of businesses acquired | entity |  | 2 |
Contingent consideration |  | $ 3,200 |
Business Combinations, goodwill |  | 5,000 |
Cash payments to acquire businesses |  | 7,500 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets |  | 1,100 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 300 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent |  | $ 900 |
Cloud-based Veterinary Practice Software Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Acquisition of a business, net of cash acquired |  |  | $ 18,700
Number of businesses acquired | item |  |  | 3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 11,700
Business Combinations, goodwill |  |  | $ 12,400
Weighted average useful lives of amortizable intangible assets |  |  | 11 years 4 months 24 days
Amortizable intangible assets deductible for income tax purposes |  |  | $ 5,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability |  |  | $ 4,200
Assets Of Cloud-based Veterinary Practice Software Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Number of businesses acquired | item |  |  | 2
Cloud-based Veterinary Practice Software Businesses, Foreign [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Number of businesses acquired | item |  |  | 2
Veterinary Reference Laboratory Testing Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Acquisition of a business, net of cash acquired |  |  | $ 6,200
Number of businesses acquired | item |  |  | 2
Weighted average useful lives of amortizable intangible assets |  |  | 13 years 3 months 18 days
Amortizable intangible assets deductible for income tax purposes |  |  | $ 4,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability |  |  | $ 1,500
Computer Software, Intangible Asset [Member] | Cloud-based Veterinary Practice Software Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Weighted average useful lives of amortizable intangible assets |  |  | 7 years
Customer Lists [Member] | Reference Laboratory Diagnostic And Consulting Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Useful life assigned to intangible asset, years |  | 15 years |
Intangibles acquired as result of business combination |  | $ 5,200 |
Customer Lists [Member] | Cloud-based Veterinary Practice Software Businesses [Member] |  |  |
Acquisitions And Strategic Investments [Line Items] |  |  |
Weighted average useful lives of amortizable intangible assets |  |  | 16 years 4 months 24 days

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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 The amount of liability arising from an inherited contingency (as defined) which has been recognized as of 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 (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 + Details
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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired 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 (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + 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 (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired 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 (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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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