Payout Percentage of Total Shareholder Return Shares (Detail) - Total Shareholders Return	12 Months Ended
	Dec. 31, 2016
2012 award | Fiscal 2014
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]
Payout percentage	195.00%
2013 Award | Fiscal 2015
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]
Payout percentage	88.00%
2014 Award | Fiscal 2016
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]
Payout percentage	27.00%