Loss on Disposal of Assets and Costs from Exit and Disposal Activities - Summary of Loss on Disposal of Assets and Costs from Exit and Disposal Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]
Accelerated depreciation		$ 2,041
Plant severance	$ (35)	641
Other restructuring activities	31
Total 2018 Restructuring Plan activities	(4)	2,682
Loss on other disposals and partial disposals of property, plant and equipment	1,108	741
Total loss on disposal of assets and costs from exit and disposal activities	$ 1,104	$ 3,423