Payout Percentage of ROIC Awards (Detail) - Performance Contingent Return On Invested Capital Shares	12 Months Ended
	Dec. 31, 2016
2012 Award | Fiscal 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage	125.00%
2013 Award | Fiscal 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage	125.00%
2014 Award | Fiscal 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage	96.00%