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Stock-Based Compensation - Additional Information (Detail)
$ in Millions
3 Months Ended
May 18, 2016
Director
shares
May 11, 2015
Director
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
May Two Thousand Fifteen [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock expense       $ 0.2
May Two Thousand Sixteen [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock expense     $ 0.1  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation awards, requisite service period     3 years  
Restricted Stock [Member] | May Two Thousand Fifteen [Member] | Board of Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares of common stock issued | shares   132,496    
Number of non employee directors | Director   7    
Restricted Stock [Member] | May Two Thousand Sixteen [Member] | Board of Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares of common stock issued | shares 149,448      
Number of non employee directors | Director 3      
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation awards, requisite service period     3 years  
Unrecognized compensation cost     $ 9.8  
Weighted average period for shares to vest     1 year  
Performance Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost     $ 7.9  
Weighted average period for shares to vest     2 years  
Restricted Stock Issued to Directors [Member] | May Two Thousand Sixteen [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost     $ 0.1  
2014 Long-Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized to be issue | shares     16,000,000  
Number of shares are available for future grants | shares     1,379,166