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Share-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 1.9 $ 3.5
Restricted stock units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Annual share-based compensation grants 569,594  
Grant date fair value $ 16.30  
Graded vesting period 3 years  
Performance share units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Annual share-based compensation grants 304,425  
Grant date fair value $ 16.30  
Cliff vesting period 34 months  
Continuing operations    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 1.9 $ 2.1