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Share-Based Compensation - Summary of Information about Restricted Stock Awards (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
installment
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unearned Compensation | $ $ 4,800,000    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) | shares 446,000 354,000 571,000
Number of vesting installments | installment 3    
Restricted Stock | October 2016      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) | shares 410,751.000    
Unearned Compensation | $ $ 528,100    
Remaining Period (in months) 10 months    
Number of vesting installments | installment 3    
Restricted Stock | July 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) | shares 6,000    
Unearned Compensation | $ $ 13,300    
Remaining Period (in months) 10 months    
Number of vesting installments | installment 3    
Restricted Stock | October 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) | shares 302,574.000    
Unearned Compensation | $ $ 1,673,700    
Remaining Period (in months) 22 months    
Number of vesting installments | installment 3    
Restricted Stock | May 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) | shares 64,212.000    
Unearned Compensation | $ $ 180,000    
Remaining Period (in months) 4 months    
Number of vesting installments | installment 3    
Restricted Stock | October 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) | shares 381,857.000    
Unearned Compensation | $ $ 2,444,900    
Remaining Period (in months) 34 months    
Number of vesting installments | installment 3