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Equity Incentive Awards - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
May. 31, 2015
Feb. 28, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation       $ 2,300 $ 2,600 $ 6,268 $ 4,998
Number of shares available for grant       3,405,794   3,405,794  
Management              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights Full   Full        
Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights   One-third One-third        
Restricted Stock | Management              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options, grants in period 3,000   78,000        
Fair value of shares issued $ 200   $ 4,300        
Equity instruments other than options vesting date Dec. 31, 2015   Dec. 31, 2015        
Restricted Stock | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options, grants in period   29,440 47,100        
Fair value of shares issued   $ 1,600 $ 2,600        
Restricted Stock | Director | Phase One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options vesting date   Nov. 12, 2015 Dec. 31, 2015        
Restricted Stock | Director | Phase Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options vesting date   May 12, 2016 Dec. 31, 2016        
Restricted Stock | Director | Phase Three              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options vesting date   May 12, 2017 Dec. 31, 2017        
Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares authorized for issuance       3,750,000   3,750,000