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Share-Based Compensation - Summary of Performance Based Stock Option (Detail) - Performance Shares [Member] - HCM Share Based Compensation Plans [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Shares    
Options Outstanding at Beginning of Period 1,035,647  
Options, Granted 0  
Options, Exercised 0  
Options, Forfeited or expired (5,572)  
Options Outstanding at End of Period 1,030,075 1,035,647
Weighted Average Exercise Price (per share)    
Weighted Average Exercise Price at Beginning of Period $ 13.46  
Weighted Average Exercise Price, Granted 0  
Weighted Average Exercise Price, Exercised 0  
Weighted Average Exercise Price, Forfeited or expired (13.46)  
Weighted Average Exercise Price at End of Period $ 13.46 $ 13.46
Weighted Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Term (in years) 3 years 2 months 12 days 3 years 6 months
Aggregate intrinsic value    
Aggregate Intrinsic Value $ 0 $ 0