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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value Measurements - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) security $ / shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) security $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2014 USD ($)
Investments And Fair Value Measurements [Line Items]
Change in fair value of contingent consideration	$ 11,300,000	$ (100,000)	$ (12,775,000)	$ 899,000	$ 4,761,000
Net unrealized losses on sale of securities included in other comprehensive income			$ 1,500,000		1,100,000
Net Asset Value per share \| $ / shares	$ 1		$ 1
Transfers between Level 1 and 2	$ 0	$ 0	$ 0	$ 0
Number of asset-backed securities collateralized by mortgage loans, reserved \| security	2		2
Fair value of liability	$ 22,129,000		$ 22,129,000		35,702,000	$ 56,463,000
Contingent consideration, current	8,000,000		8,000,000
Contingent consideration, noncurrent	14,100,000		14,100,000
Increase in fair value of contingent consideration resulting from a change in discount rate			200,000
Decrease in fair value of contingent consideration resulting from a change in discount rate			200,000
Payments	100,000		751,000		30,924,000
Notional amount of derivative assets and liabilities	250,700,000		250,700,000		239,400,000
Increase in Fair Value
Investments And Fair Value Measurements [Line Items]
Change in fair value of contingent consideration			2,000,000
Decrease in Fair Value
Investments And Fair Value Measurements [Line Items]
Change in fair value of contingent consideration			1,700,000
Maximum Potential Payment
Investments And Fair Value Measurements [Line Items]
Payments			11,300,000
Designated as Cash Flow Hedges
Investments And Fair Value Measurements [Line Items]
Notional amount of derivative assets and liabilities	0		0		3,900,000
All Acquisitions
Investments And Fair Value Measurements [Line Items]
Fair value of liability	$ 22,100,000		$ 22,100,000		35,700,000
Reggiani
Investments And Fair Value Measurements [Line Items]
Payments					21,500,000
Optitex Ltd
Investments And Fair Value Measurements [Line Items]
Payments					6,800,000
Rialco Limited
Investments And Fair Value Measurements [Line Items]
Payments					1,300,000
Shuttleworth
Investments And Fair Value Measurements [Line Items]
Payments					$ 1,200,000
Earnout Achievement Probability Minimum
Investments And Fair Value Measurements [Line Items]
Probability of achieving revenue	50.00%		50.00%
Earnout Achievement Probability Maximum
Investments And Fair Value Measurements [Line Items]
Probability of achieving revenue	100.00%		100.00%
Minimum \| All Acquisitions
Investments And Fair Value Measurements [Line Items]
Fair value key assumption risk-free discount rate			0.60%		0.60%
Maximum \| All Acquisitions
Investments And Fair Value Measurements [Line Items]
Fair value key assumption risk-free discount rate			4.98%		4.98%
Level 1
Investments And Fair Value Measurements [Line Items]
Net Asset Value per share \| $ / shares	$ 1		$ 1
Convertible Senior Notes Due Two Thousand Nineteen
Investments And Fair Value Measurements [Line Items]
Debt instrument, principal amount							$ 345,000,000
Debt instrument, fair value disclosure	$ 342,800,000		$ 342,800,000