Business Combinations - Summary of Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 21, 2015	Aug. 17, 2015	Mar. 13, 2015
Branchbird [Member]
Business Acquisition [Line Items]
Customer relationships		5 years
Accounts receivable		$ 540
Other assets		16
Accounts payable and accrued expenses		(86)
Customer relationships		2,100
Goodwill (deductible for tax purposes)		1,613
Total purchase price		$ 4,183
Zero2Ten [Member]
Business Acquisition [Line Items]
Customer relationships			5 years
Accounts receivable			$ 1,596
Other assets			142
Deferred revenue			(1,158)
Accounts payable and accrued expenses			(580)
Customer relationships			2,800
Goodwill (deductible for tax purposes)			6,210
Total purchase price			$ 9,010
M2 Dynamics [Member]
Business Acquisition [Line Items]
Customer relationships	6 years
Accounts receivable	$ 2,878
Other assets	21
Accounts payable and accrued expenses	(866)
Customer relationships	7,700
Goodwill (deductible for tax purposes)	10,038
Total purchase price	$ 19,771