Organization and Significant Accounting Policies - Activity in Deferred Revenue Reserve (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of year	$ 0
Additions to deferred revenue through acquisitions	7,944
New contracts sold	20,569
Less: reductions for revenue recognized	(2,356)
Balance at end of year	26,157
Deferred revenue, current	11,012
Deferred revenue, noncurrent	$ 15,145