Acquisition of Tech Blend - Additional Information (Detail) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended
	Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2017
Maximum [Member]
Business Acquisition [Line Items]
Intangible assets, amortization period			25 years
Minimum [Member]
Business Acquisition [Line Items]
Intangible assets, amortization period			10 years
Tech Blend [Member]
Business Acquisition [Line Items]
Acquisition date	2017-11
Preliminary purchase price paid in cash	$ 65,000,000
Revenues		$ 4,000,000
Intangible assets	31,000,000
Tech Blend [Member] | Developed Technologies [Member]
Business Acquisition [Line Items]
Intangible assets	$ 21,000,000
Intangible assets, amortization period	25 years
Tech Blend [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets	$ 2,000,000
Intangible assets, amortization period	10 years
Tech Blend [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets	$ 8,000,000
Intangible assets, amortization period	12 years
Tech Blend [Member] | Maximum [Member]
Business Acquisition [Line Items]
Acquisition costs		$ 1,000,000