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Equity Incentive Awards - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 10, 2016
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
May 13, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     $ 2,500 $ 2,200 $ 4,393 $ 3,960  
Term of award ( in years)         10 years    
Number of shares available for grant (in shares)     3,264,282   3,264,282    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         220,000    
Proceeds from Stock Options Exercised         $ 5,200    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 74.53            
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) 14,705 45,784          
Fair value of shares issued $ 1,100 $ 3,100          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 7,550            
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%