Investments and fair value measurements.

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Topic 320
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-Section 50
-Paragraph 2
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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-SubTopic 30
-Section 25
-Paragraph 6
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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
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Fair Value Measurements - Investments in Accordance with Hierarchy (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments And Fair Value Measurements [Line Items]
Assets	$ 134,006	$ 148,697
Contingent consideration, current and noncurrent	22,129	35,702	$ 56,463
U.S. Government and sponsored entities
Investments And Fair Value Measurements [Line Items]
Assets	59,049	59,164
Corporate debt securities
Investments And Fair Value Measurements [Line Items]
Assets	65,867	78,906
Municipal securities
Investments And Fair Value Measurements [Line Items]
Assets	379	380
Asset-backed securities
Investments And Fair Value Measurements [Line Items]
Assets	8,503	9,805
Mortgage-backed securities – residential
Investments And Fair Value Measurements [Line Items]
Assets	208	442
Fair Value
Investments And Fair Value Measurements [Line Items]
Assets	135,024	158,594
Contingent consideration, current and noncurrent	22,129	35,702
Self-insurance	969	902
Liabilities	23,098	36,604
Fair Value \| Money market funds
Investments And Fair Value Measurements [Line Items]
Assets	1,017	9,897
Fair Value \| U.S. Government and sponsored entities
Investments And Fair Value Measurements [Line Items]
Assets	59,049	59,164
Fair Value \| Corporate debt securities
Investments And Fair Value Measurements [Line Items]
Assets	65,867	78,906
Fair Value \| Municipal securities
Investments And Fair Value Measurements [Line Items]
Assets	378	380
Fair Value \| Asset-backed securities
Investments And Fair Value Measurements [Line Items]
Assets	8,505	9,805
Fair Value \| Mortgage-backed securities – residential
Investments And Fair Value Measurements [Line Items]
Assets	208	442
Fair Value \| Level 1
Investments And Fair Value Measurements [Line Items]
Assets	34,224	43,158
Contingent consideration, current and noncurrent	0	0
Self-insurance	0	0
Liabilities	0	0
Fair Value \| Level 1 \| Money market funds
Investments And Fair Value Measurements [Line Items]
Assets	1,017	9,897
Fair Value \| Level 1 \| U.S. Government and sponsored entities
Investments And Fair Value Measurements [Line Items]
Assets	33,207	33,261
Fair Value \| Level 1 \| Corporate debt securities
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 1 \| Municipal securities
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 1 \| Asset-backed securities
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 1 \| Mortgage-backed securities – residential
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 2
Investments And Fair Value Measurements [Line Items]
Assets	100,757	115,385
Contingent consideration, current and noncurrent	0	0
Self-insurance	0	0
Liabilities	0	0
Fair Value \| Level 2 \| Money market funds
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 2 \| U.S. Government and sponsored entities
Investments And Fair Value Measurements [Line Items]
Assets	25,842	25,903
Fair Value \| Level 2 \| Corporate debt securities
Investments And Fair Value Measurements [Line Items]
Assets	65,867	78,906
Fair Value \| Level 2 \| Municipal securities
Investments And Fair Value Measurements [Line Items]
Assets	378	380
Fair Value \| Level 2 \| Asset-backed securities
Investments And Fair Value Measurements [Line Items]
Assets	8,462	9,754
Fair Value \| Level 2 \| Mortgage-backed securities – residential
Investments And Fair Value Measurements [Line Items]
Assets	208	442
Fair Value \| Level 3
Investments And Fair Value Measurements [Line Items]
Assets	43	51
Contingent consideration, current and noncurrent	22,129	35,702
Self-insurance	969	902
Liabilities	23,098	36,604
Fair Value \| Level 3 \| Money market funds
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 3 \| U.S. Government and sponsored entities
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 3 \| Corporate debt securities
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 3 \| Municipal securities
Investments And Fair Value Measurements [Line Items]
Assets	0	0
Fair Value \| Level 3 \| Asset-backed securities
Investments And Fair Value Measurements [Line Items]
Assets	43	51
Fair Value \| Level 3 \| Mortgage-backed securities – residential
Investments And Fair Value Measurements [Line Items]
Assets	$ 0	$ 0