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Summary of RSU Activity (Detail) (Restricted Stock Units (RSUs), USD $)
6 Months Ended
Jun. 30, 2013
Restricted Stock Units (RSUs)
 
Options Outstanding Number of Shares  
Outstanding at beginning of period 496,000
Granted 406,688
Shares vested (50,000)
Outstanding at ending of period 852,688
Forfeited   
Weighted Average Fair Value  
Outstanding at beginning of period $ 20.26
Granted $ 34.42
Shares vested $ 22.30
Forfeited   
Outstanding at end of period $ 26.89
Weighted Average Remaining Contractual Life  
Outstanding at end of period 2 years 3 months