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Stock Incentive Plan - Additional Information (Detail) - LTI Program - USD ($)
$ in Millions
Feb. 19, 2017
May 09, 2016
Feb. 15, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period   3 years 3 years
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of performance shares to be earned   0.00% 0.00%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of performance shares to be earned   200.00% 200.00%
Weighted Average      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of performance shares to be earned   50.00% 50.00%
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of awards granted 50.00% 50.00% 50.00%
Grant date fair value $ 7.9    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of awards granted 50.00% 50.00% 50.00%
Grant date fair value $ 7.9