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Summary of Stock Option Activity (Parenthetical) (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Granted 134,500  
Outstanding amount of stock appreciation right units 2,406,455 [1] 3,316,380
Exercisable amount of stock appreciation right units 1,562,042  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding amount of stock appreciation right units 2,107,339  
Exercisable amount of stock appreciation right units 1,412,528  
Stock Appreciation Rights (SARs) | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum percentage of stock appreciation right units 75.00%  
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 2,107,339 shares of the Company's common stock issuable upon exercise.