Organization and Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at January 1	$ 1,922	$ 1,189	$ 460
Provision charged to expense	0	1,099	1,175
Write-offs / Recoveries	(150)	(366)	(446)
Balance at December 31	$ 1,772	$ 1,922	$ 1,189