Investments and Fair Value Measurements - Summary of Changes in Fair Value of Contingent Consideration (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration	$ 12,277	$ 21,052
Fair value of contingent consideration	49,732	21,052
Changes in valuation	(2,430)	(3,813)
Payments	(3,041)	(14,047)
Foreign currency adjustment	(244)	(1,079)
Fair value of contingent consideration	49,732	12,277
SmartLinc, Inc. [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration	1,546
Fair value of contingent consideration	1,546	1,546
Payments	(300)
Fair value of contingent consideration		$ 1,546
Date of acquisition agreement		Jan. 16, 2014
Direct Smile [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration	4,162
Fair value of contingent consideration	4,162	$ 4,162
Fair value of contingent consideration		$ 4,162
Date of acquisition agreement		Jul. 18, 2014
DIMS [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration	4,456
Fair value of contingent consideration	4,456	$ 4,456
Fair value of contingent consideration		$ 4,456
Date of acquisition agreement		Sep. 15, 2014
Reggiani Macchine [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration	43,170
Fair value of contingent consideration	$ 43,170
Date of acquisition agreement	Jul. 01, 2015