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Shared-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options granted (in shares) 210,400
Weighted average grant date fair value of the options granted (in dollars per share) | $ / shares $ 2.77
Total grant-date fair value of restricted stock | $ $ 2.6
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock units issued (in shares) 309,234
Fair value assumptions, exercise price (in dollars per share) | $ / shares $ 7.85
TSR Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock units issued (in shares) 136,000
Percentage of shares issuable based on threshold performance 50.00%
Percentage of shares issuable based on target performance 100.00%
Percentage of shares issuable based on maximum performance 150.00%
ROIC Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock units issued (in shares) 174,000
Percentage of shares issuable based on threshold performance 35.00%
Percentage of shares issuable based on target performance 100.00%
Percentage of shares issuable based on maximum performance 150.00%
Officers and Key Employees | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock awards granted vesting period 3 years
Non-executive Directors | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock awards granted vesting period 1 year