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Summary of Stock Option Activity (Parenthetical) (Detail) - shares
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding amount of stock appreciation right units 2,754,248 [1] 3,316,380
Exercisable amount of stock appreciation right units [2] 1,820,312  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding amount of stock appreciation right units 2,405,770  
Exercisable amount of stock appreciation right units 1,643,348  
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 2,405,770 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 1,643,348 shares of the Company's common stock issuable upon exercise.