Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Initial cash consideration, net of cash acquired	$ 34,575	$ 91	$ 100
Goodwill	715,644	$ 686,108	$ 683,683
Charge on contingent liability remeasured	505
Payments Type One
Business Acquisition [Line Items]
Warranty and indemnity hold back payments	$ 2,000
Warranty and indemnity hold back payments release period	18 months
Liabilities fair value assumption discount rate percentage	3.00%
Payments Type Two
Business Acquisition [Line Items]
Warranty and indemnity hold back payments	$ 1,200
Warranty and indemnity hold back payments release period	four years
Liabilities fair value assumption discount rate percentage	3.25%
TFC, DMS and Vista
Business Acquisition [Line Items]
Combined purchase consideration	$ 51,200
Initial cash consideration, net of cash acquired	34,600
Goodwill	32,100
Aggregate intangible assets arising from acquisitions	10,600
Extended purchase commitments under the acquisition agreements	6,500
Charge on contingent liability remeasured	500
TFC, DMS and Vista | Level 3
Business Acquisition [Line Items]
Fair value of contingent consideration	$ 1,200