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Share-Based Payments - Additional Information (Detail)
1 Months Ended 6 Months Ended
Sep. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Restricted Stock
Minimum
Jun. 30, 2013
Restricted Stock
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       1 year 5 years
Number of stock warrants granted to third party in connection with acquisition 1,500,000        
Exercise price of warrants 16.28        
Warrants exercisable term 5 years        
Stock warrants outstanding   1,500,000 1,500,000    
Weighted average exercise price of warrants outstanding   16.28 16.28    
Expiration date of warrants outstanding   2017-09-12