Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill [Line Items]
Balance at beginning of the period	$ 44,199	[1]
Adjustments to goodwill for foreign currency translation	(737)
Goodwill Ending Balance	$ 43,462

[1] Derived from audited financial statements