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Investments and Fair Value Measurements - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2017 USD ($) Transactions $ / shares	Dec. 31, 2016 USD ($) Transactions $ / shares	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	$ 1,100,000	$ 1,100,000	$ 800,000
Available-for-sale securities, net realized gains		300,000	400,000	$ 100,000
Available-for-sale securities, realized gains		$ 300,000	400,000
Available-for-sale securities, realized losses				0
Net Asset Value per share \| $ / shares	$ 1	$ 1
Transfers between Level 1 and 2 \| Transactions		0	0
Fair value of liability	$ 35,702,000	$ 35,702,000	$ 56,463,000	$ 54,796,000
Contingent consideration, current	14,992,000	14,992,000	19,244,000
Contingent consideration, noncurrent	20,800,000	20,800,000
Payments		30,924,000	28,111,000
Increase in fair value of contingent consideration resulting from a change in discount rate		2,000,000
Decrease in fair value of contingent consideration resulting from a change in discount rate		$ 2,500,000
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	239,400,000	$ 239,400,000	161,800,000
Increase in Fair Value [Member]
Investments And Fair Value Measurements [Line Items]
Change in fair value of contingent consideration		400,000
Decrease in Fair Value [Member]
Investments And Fair Value Measurements [Line Items]
Change in fair value of contingent consideration		400,000
Maximum Potential Payment [Member]
Investments And Fair Value Measurements [Line Items]
Payments		12,000,000
Designated as Cash Flow Hedges [Member]
Investments And Fair Value Measurements [Line Items]
Notional amount of derivative assets and liabilities	3,900,000	3,900,000	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
Contingent consideration, current	1,300,000	1,300,000
Contingent consideration, noncurrent	2,100,000	2,100,000
Payments		1,300,000
Reggiani And Matan [Member]
Investments And Fair Value Measurements [Line Items]
Payments		21,500,000	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]
Change in fair value of contingent consideration		6,500,000
Rialco, Optitex, Reggiani, DirectSmile, and CTI [Member]
Investments And Fair Value Measurements [Line Items]
Change in fair value of contingent consideration			6,800,000
All Acquisitions [Member]
Investments And Fair Value Measurements [Line Items]
Earnout interest accretion		1,700,000	2,700,000
Optitex Ltd [Member]
Investments And Fair Value Measurements [Line Items]
Fair value of liability			$ 22,300,000
Contingent consideration, current	9,100,000	9,100,000
Contingent consideration, noncurrent	11,800,000	11,800,000
Change in fair value of contingent consideration	$ 2,000,000
Payments		$ 6,800,000
Earnout [Member] \| Rialco Limited [Member]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate		0.80%
Earnout Achievement Probability Minimum [Member]
Investments And Fair Value Measurements [Line Items]
Probability of achieving revenue	50.00%	50.00%	50.00%
Earnout Achievement Probability Maximum [Member]
Investments And Fair Value Measurements [Line Items]
Probability of achieving revenue	100.00%	100.00%	100.00%
Minimum [Member]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate		14.00%	14.00%	14.00%
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]
Investments And Fair Value Measurements [Line Items]
Fair value discount rate		30.00%	30.00%	30.00%
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