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Equity Incentive Awards - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 29, 2016
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation   $ 1,914 $ 1,716
Term of award ( in years)   10 years  
Number of shares available for grant (in shares)   3,286,537  
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights One-third    
Restricted Stock | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments other than options, grants in period (in shares) 73,000    
Fair value of shares issued $ 4,900    
Equity instruments other than options vesting date Dec. 31, 2016    
Restricted Stock | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments other than options, grants in period (in shares) 45,784    
Fair value of shares issued $ 3,100    
Restricted Stock | Director | Phase One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments other than options vesting date Dec. 31, 2016    
Restricted Stock | Director | Phase Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments other than options vesting date Dec. 31, 2017    
Restricted Stock | Director | Phase Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments other than options vesting date Dec. 31, 2018    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for issuance   3,750,000  
Vesting on December 31, 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting arrangement (in percentage)   33.33%  
Vesting on December 31, 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting arrangement (in percentage)   33.33%  
Vesting on December 31, 2016      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting arrangement (in percentage)   33.33%