Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.6.0.2
Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 12, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation (equity-classified) $ 81 $ 1,511   $ 4,540 $ 3,627
Exercised (in shares)     0    
Deferred compensation obligation       0 17,148
Recognized expense 100 500   900 1,700
Compensation 2,557   $ 2,557 9,904  
Liability-classified awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation (equity-classified) 0 $ (19)   $ (711) $ 4,520
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period   10 years      
Vesting period     3 years    
Weighted-average grant-date fair value of options granted during period (per share)       $ 3.15 $ 7.46
Total intrinsic value of options exercised       $ 2,300  
Exercised (in shares)       0  
Unrecognized compensation cost weighted-average recognition period     1 year 6 months    
Total grant-date fair values of options vested during period       $ 1,300 $ 1,800
Deferred Common Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     0    
Granted (in dollars per share)     $ 0.00    
Deferred compensation obligation       3,400  
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 2,400   $ 2,400    
Granted (in shares)     107,563    
Granted (in dollars per share)     $ 23.15    
Total grant-date fair values of RSUs that vested during period       $ 2,200 $ 600
Performance Based Restricted Stock Units (PBRSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     0    
Granted (in dollars per share)     $ 0.00    
Performance Based Restricted Stock Units (PBRSUs) | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares expected to vest at grant date   0.00%      
Performance Based Restricted Stock Units (PBRSUs) | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares expected to vest at grant date   200.00%      
Vests ratably over 3 years | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting description     One-third vesting in each year    
Award vesting rights percentage   33.33%      
Vests ratably over 3 years | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting description     One-third vesting in each year    
Award vesting rights percentage   33.33%      
Vests ratably over 3 years | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting description     One-third vesting in each year    
Award vesting rights percentage   33.33%      
Performance Period 1 | Performance Based Restricted Stock Units (PBRSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period   1 year      
Performance Period 2 | Performance Based Restricted Stock Units (PBRSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period   2 years      
Performance Period 3 | Performance Based Restricted Stock Units (PBRSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period   3 years      
Employees and Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuance 749,600   749,600    
Non-employee Director | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised (in shares)     0 0  
Granted (in shares)       195,395 15,501
Granted (in dollars per share)       $ 1.33 $ 11.61
Other Pension Plan, Postretirement or Supplemental Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Pension and Other Postretirement Benefit Expense $ 100 $ 100   $ 100 $ 100
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent 1,700   $ 1,700 2,100  
Pension Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay     6.00%    
Compensation $ 100   $ 100 $ 200