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Summary of Stock Option Activity (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares, Granted 810,250 [1]
Outstanding amount of stock appreciation right units 2,848,877
Exercisable amount of stock appreciation right units 1,499,082
Stock appreciation rights (SARs)
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares, Granted 678,250
Maximum | Stock appreciation rights (SARs)
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Maximum percentage of stock appreciation right units 75.00%
[1] Included 678,250 SAR units which are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant