Annual report pursuant to Section 13 and 15(d)

Activity of Awarded Deferred Common Stock Units (Detail)

v3.6.0.2
Activity of Awarded Deferred Common Stock Units (Detail) - USD ($)
8 Months Ended 12 Months Ended
Sep. 12, 2016
Dec. 31, 2016
Number of shares    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Cancelled $ 3,083,821  
Weighted-Average Grant Date Fair Value    
Share-based Compensation Arrangement by Share-by Payment Awards, Options, Weighted Average Price of Shares Canceled $ 16.05  
Deferred Common Stock Units    
Number of shares    
Balance at beginning of year (in shares) 447,498 447,498
Granted (in shares)   0
Converted (in shares)   0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Cancelled   $ (447,498)
Balance at end of year (in shares)   0
Weighted-Average Grant Date Fair Value    
Balance at beginning of year (in dollars per share) $ 7.75 $ 7.75
Granted (in dollars per share)   0.00
Converted (in dollars per share)   0.00
Share-based Compensation Arrangement by Share-by Payment Awards, Options, Weighted Average Price of Shares Canceled   7.75
Balance at end of year (in dollars per share)   $ 0.00