Organization and Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at January 1	$ 1,189	$ 460	$ 430
Provision charged to expense	(762)	(707)	(26)
Write-offs / Recoveries	(366)	(446)	(216)
Balance at December 31	1,922	1,189	460
Including Foreign Currency Translation
Allowance for Doubtful Accounts Receivable [Roll Forward]
Provision charged to expense	$ 1,099	$ 1,175	$ 246