Change in fair value of contingent consideration resulting from a change in revenue probability.

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Change in fair value resulting from discount percentage change.

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Contingent consideration interest accretion.

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Fair value Level1 To Level2 transfer number of securities.

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Investments and fair value measurements.

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Maturity period for available for sale securities.

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Maturity Period Of Highly Liquid Investments

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Percentage point change increase (decrease) in discount rate of fair value contingent consideration.

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Percentage point change in revenue probability assumed for purpose of sensitivity analysis.

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Probability Of Achieving Revenue Performance Targets For All Acquisitions at their respective acquisition dates.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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No definition available.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Amount of loss contingency liability.

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Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

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Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer.

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Amount of cash outflow reducing loss contingency liability.

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Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure.

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Investments and Fair Value Measurements - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2017 USD ($) Transactions $ / shares	Jun. 30, 2016 USD ($) Transactions $ / shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Investments And Fair Value Measurements [Line Items]
Maturity of highly liquid investments			Three months or less
Maturity of marketable investments			Greater than three months
Net unrealized gains (losses) on sale of securities included in other comprehensive income	$ (400,000)		$ (400,000)		$ (800,000)
Available-for-sale securities, net realized gains		$ 200,000		$ 200,000
Net Asset Value per share \| $ / shares	$ 1		$ 1
Cash equivalents and short term investments	$ 282,163,000		$ 282,163,000		319,003,000
Transfers between Level 1 and 2 \| Transactions			0	0
Fair value of liability	61,414,000		$ 61,414,000		56,463,000	$ 54,796,000
Fair value discount rate			4.98%
Contingent liabilities, current	38,000,000		$ 38,000,000
Contingent liabilities, noncurrent	23,400,000		23,400,000
Payments			1,294,000	$ 1,868,000	28,111,000
Change in fair value of contingent consideration			2,000,000
Change in fair value of contingent consideration resulting from a change in discount rate			$ 500,000
Probability-adjusted revenue			5.00%
Percentage of increase or decrease in the fair value of contingent consideration			1.00%
Notional amount of derivative assets and liabilities	148,700,000		$ 148,700,000		161,800,000
Designated as Cash Flow Hedges [Member]
Investments And Fair Value Measurements [Line Items]
Notional amount of derivative assets and liabilities	$ 3,600,000		3,600,000		3,200,000
Metrix [Member]
Investments And Fair Value Measurements [Line Items]
Payments					200,000
SmartLinc, Inc. [Member]
Investments And Fair Value Measurements [Line Items]
Payments					400,000
Direct Smile [Member]
Investments And Fair Value Measurements [Line Items]
Payments					3,600,000
Reggiani And Matan [Member]
Investments And Fair Value Measurements [Line Items]
Payments					23,800,000
Shuttleworth [Member]
Investments And Fair Value Measurements [Line Items]
Payments			1,300,000
Optitex Ltd and CTI [Member]
Investments And Fair Value Measurements [Line Items]
Fair value of contingent consideration increase (decrease)			1,800,000
Rialco, Optitex, Reggiani, DirectSmile, and CTI [Member]
Investments And Fair Value Measurements [Line Items]
Fair value of contingent consideration increase (decrease)					6,800,000
All Acquisitions [Member]
Investments And Fair Value Measurements [Line Items]
Earnout interest accretion			$ 900,000		$ 2,700,000
Earnout Achievement Probability Minimum [Member]
Investments And Fair Value Measurements [Line Items]
Probability of achieving revenue	60.00%		60.00%		60.00%
Earnout Achievement Probability Maximum [Member]
Investments And Fair Value Measurements [Line Items]
Probability of achieving revenue	100.00%		100.00%		100.00%
Minimum [Member] \| Monte Carlo Valuation Method [Member]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate			0.60%		0.60%
Minimum [Member] \| Earnout [Member] \| Probability-Adjusted Method [Member]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate			4.70%		4.70%
Maximum [Member] \| Monte Carlo Valuation Method [Member]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate			4.98%		4.98%
Maximum [Member] \| Earnout [Member] \| Probability-Adjusted Method [Member]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate			6.00%		6.00%
Maximum Potential Payment [Member]
Investments And Fair Value Measurements [Line Items]
Payments			$ 10,100,000
Money Market Funds [Member]
Investments And Fair Value Measurements [Line Items]
Net Asset Value per share \| $ / shares	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Cash equivalents and short term investments	$ 9,497,000		$ 9,497,000		$ 23,575,000