Basis of Presentation - Additional Information (Detail) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2017 USD ($) Segment	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Nature Of Operations [Line Items]
Number of operating segments | Segment	2
Net foreign exchange losses resulting from foreign currency transactions included in other income	$ 12		$ 17
Cumulative-effect adjustment to retained earnings				$ 510
Adjustments of deferred tax assets	13,500			13,300
Adjustments of deferred tax valuation allowance	200	$ 7,600		12,600
Retained Earnings [Member]
Nature Of Operations [Line Items]
Cumulative-effect adjustment to retained earnings				$ 510
ASU No. 2016-09 [Member]
Nature Of Operations [Line Items]
Deferred tax assets	600
Adjustments of deferred tax assets	100
Adjustments of deferred tax valuation allowance	200
ASU No. 2016-09 [Member] | Retained Earnings [Member]
Nature Of Operations [Line Items]
Cumulative-effect adjustment to retained earnings	$ 500