Equity - Summary of Changes in Balances Comprising Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 108,175	$ 98,214
Other comprehensive loss before reclassifications	(55)	(4,809)
Effective portion reclassified to Net Income	1,598
Ending balance	147,976	108,175
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(10,427)	(7,067)
Other comprehensive loss before reclassifications	(635)	(3,360)
Effective portion reclassified to Net Income	0
Ending balance	(11,062)	(10,427)
Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,964)	(515)
Other comprehensive loss before reclassifications	580	(1,449)
Effective portion reclassified to Net Income	1,598
Ending balance	214	(1,964)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(12,391)	(7,582)
Ending balance	$ (10,848)	$ (12,391)