Annual report pursuant to Section 13 and 15(d)

Executive Retirement and Exit Activities - Exit Activities (Detail)

v3.10.0.1
Executive Retirement and Exit Activities - Exit Activities (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 12, 2016
USD ($)
Restructuring and Related Activities [Abstract]      
Separation Agreement, Consulting Fees $ 0.3    
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost $ 0.6    
Restructuring and Related Cost, Number of Positions Eliminated   53  
Severance and Termination Benefits Paid   $ 2.1  
Severance and Termination Benefits   1.4  
Retention Bonuses   $ 0.7  
Liabilities Subject to Compromise, Early Contract Termination Fees     $ 1.7
Restructuring Reserve     $ 10.8