Changes in Projected Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Change in projected benefit obligations
Projected benefit obligations, beginning of year/ acquisition	$ 13,796	$ 11,678
Interest cost		364
Actuarial (gain) loss	(2,492)	2,887
Benefits paid	(58)	(216)
Annuity purchase	(11,008)
Currency adjustment	(238)	(917)
Projected benefit obligations, end of year		13,796
Change in plan assets
Fair value of plan assets, beginning of year/ acquisition	15,533	11,678
Actual return on plan assets	(1,903)	2,618
Employer (refund) contributions	(2,295)	2,471
Benefits paid	(58)	(216)
Annuity purchase	(11,008)
Currency adjustment	$ (269)	(1,018)
Fair value of plan assets, end of year		15,533
Net Plan funding, end of year		$ 1,738