Shared-Based Compensation - Schedule of Performance Based Awards Goals with Respect to TSR and ROIC (Detail)	3 Months Ended
	Mar. 31, 2019
TSR Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold performance, percentage	35.00%
Target performance, percentage	50.00%
Maximum performance, percentage	75.00%
ROIC Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold performance, percentage	4.70%
Target performance, percentage	5.80%
Maximum performance, percentage	7.00%