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Share-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation         $ 4.3 $ 10.0
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      
Restricted stock units | Non-Employee Directors            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Annual share-based compensation grants 75,745          
Grant date fair value $ 12.08          
Vesting date 2018-05          
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   $ 2.4   $ 3.7 $ 4.3 $ 5.8