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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
May 06, 2019
Mar. 11, 2019
Mar. 11, 2019
Feb. 28, 2019
Jul. 23, 2018
May 07, 2018
Apr. 30, 2018
Feb. 22, 2018
May 07, 2018
Jun. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized stock based compensation related to all stock-based awards                   $ 25.9  
Weighted average period, expense to recognize                   2 years 1 month 6 days  
Chief Executive Officer | Performance metric based on Company's TSR                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Allocation of RSU's to performance metrics (percent)       30.00%              
Chief Executive Officer | Performance metric based on Company's earnings per share                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Allocation of RSU's to performance metrics (percent)       70.00%              
Restricted Stock Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares)                   1,656,333  
Fair value of RSUs (in dollars per share)                   $ 12.40 $ 11.05
Restricted Stock Units (RSUs) | Performance-based RSUs | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting rights (percent)       0.00%       0.00%      
Restricted Stock Units (RSUs) | Performance-based RSUs | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting rights (percent)       100.00%       100.00%      
Restricted Stock Units (RSUs) | Employees and Officers | Time-vested RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares)   3,025   990,723   4,258   633,107      
Restricted stock units, vesting period     3 years           3 years    
Closing stock price on date of grant (in dollars per share)   $ 13.22 $ 13.22 $ 12.60   $ 17.61   $ 16.94 $ 17.61    
Restricted Stock Units (RSUs) | Chief Executive Officer                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares)       247,619       184,179      
Restricted Stock Units (RSUs) | President                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares)       238,095       177,095      
Restricted Stock Units (RSUs) | Chief Financial Officer                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares)       114,285       85,005      
Restricted Stock Units (RSUs) | Non-employee Members on Board of Directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares) 61,488                    
Restricted Stock Units (RSUs) | Non-employee Members on Board of Directors | Time-vested RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares)         6,677   40,910        
Closing stock price on date of grant (in dollars per share)         $ 16.37   $ 17.11        
Restricted Stock Units (RSUs) | Employees Officers And Directors | Performance-based RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Closing stock price on date of grant (in dollars per share)       $ 12.60       $ 16.94      
Fair value of RSUs (in dollars per share)       $ 8.16       $ 10.97      
Restricted Stock Units (RSUs) | Certain employees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, granted (shares) 1,098                    
Restricted Stock Units (RSUs) | Certain Employees and Directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units, vesting period 3 years                    
Closing stock price on date of grant (in dollars per share) $ 13.66                    
2013 Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock (shares)                   11,727,833  
Shares available for future grant (shares)                   5,833,208