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Investments and Fair Value Measurements - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2017 USD ($) Transactions $ / shares	Sep. 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		$ 100,000	$ 200,000	$ 300,000
Net Asset Value per share \| $ / shares	$ 1		$ 1
Cash equivalents and short term investments	$ 242,348,000		$ 242,348,000		319,003,000
Transfers between Level 1 and 2 \| Transactions			0	0
Fair value of liability	53,520,000		$ 53,520,000		56,463,000	$ 54,796,000
Fair value discount rate			4.98%
Contingent liabilities, current	29,600,000		$ 29,600,000
Contingent liabilities, noncurrent	23,900,000		23,900,000
Payments			9,512,000	$ 1,868,000	28,111,000
Increase in fair value of contingent consideration			1,700,000
Decrease in fair value of contingent consideration			2,800,000
Increase in fair value of contingent consideration resulting from a change in discount rate			400,000
Decrease 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	191,800,000		$ 191,800,000		161,800,000
Designated as Cash Flow Hedges [Member]
Investments And Fair Value Measurements [Line Items]
Notional amount of derivative assets and liabilities	$ 3,800,000		3,800,000		3,200,000
Shuttleworth [Member]
Investments And Fair Value Measurements [Line Items]
Payments			1,200,000
Rialco Limited [Member]
Investments And Fair Value Measurements [Line Items]
Fair value of liability					2,109,000
Payments			1,300,000
Reggiani And Matan [Member]
Investments And Fair Value Measurements [Line Items]
Payments			6,900,000		23,800,000
Direct Smile [Member]
Investments And Fair Value Measurements [Line Items]
Payments					3,600,000
SmartLinc, Inc. [Member]
Investments And Fair Value Measurements [Line Items]
Payments					400,000
Metrix [Member]
Investments And Fair Value Measurements [Line Items]
Payments					200,000
Optitex Ltd and CTI [Member]
Investments And Fair Value Measurements [Line Items]
Fair value of contingent consideration increase (decrease)			2,200,000
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			$ 1,200,000		$ 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%
Maximum Potential Payment [Member]
Investments And Fair Value Measurements [Line Items]
Payments			$ 13,500,000
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]
Investments And Fair Value Measurements [Line Items]
Available-for-sale securities, net realized gains	$ 100,000
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%
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	$ 24,426,000		$ 24,426,000		$ 23,575,000