Business Acquisitions - 2016 Acquisitions - Additional Information (Detail)			12 Months Ended
	Jun. 16, 2016 USD ($)	Mar. 01, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Businesses purchased, net of cash acquired			$ 0	$ 29,559,000	$ 19,932,000
Contingent consideration, current and noncurrent			10,501,000	35,702,000
Contingent consideration, current			8,268,000	$ 14,922,000
Rialco
Acquired Finite-Lived Intangible Assets [Line Items]
Businesses purchased, net of cash acquired		$ 8,400,000
Contingent consideration, current			$ 1,900,000
Rialco | Earnout
Acquired Finite-Lived Intangible Assets [Line Items]
Input rate			0.008
Optitex | Productivity Software
Acquired Finite-Lived Intangible Assets [Line Items]
Businesses purchased, net of cash acquired	$ 11,600,000
Contingent consideration, current and noncurrent			$ 0
Fair value of contingent consideration decrease			$ (20,900,000)
Optitex | Earnout | Productivity Software
Acquired Finite-Lived Intangible Assets [Line Items]
Input rate			0.0339
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Input rate			0.30