Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			$ 2,524	$ 626	$ 2,760	$ 1,159
Facility Closing [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			$ 100		$ 2,300
Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expenses				$ 500		$ 1,100
Corvallis Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring, initiation date					2016-03
Restructuring, completion date					Jun. 30, 2017
Minimum lease payment obligation					$ 5,600
Corvallis Plan [Member] | Facility Closing [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 2,300	$ 1,500