Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 111	$ 899	$ 2,886
Wood Mobile Office Business Divesture
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 500
Wood Mobile Office Business 2015 Divesture
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 100