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Summary of Stock Option Activity (Parenthetical) (Detail) - shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options granted 104,000  
Outstanding amount of stock appreciation right units 1,455,908 [1] 2,406,455
Exercisable amount of stock appreciation right units [2] 972,229  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding amount of stock appreciation right units 1,305,719  
Exercisable amount of stock appreciation right units 882,273  
Stock Appreciation Rights (SARs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate number of stock issued by the company 0  
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 1,305,719 shares of the Company's common stock issuable upon exercise.
[2] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 882,273 shares of the Company's common stock issuable upon exercise.