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Share-Based Compensation - Information for Restricted Stock Units under Equity Incentive Plan (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Weighted Average Grant Date Fair Value  
Nonvested, beginning of period $ 65.93
Granted $ 116.78
Vested $ 54.57
Forfeited $ 65.31
Nonvested, end of period $ 66.30
Restricted stock units
 
Shares  
Nonvested, beginning of period 682,347
Granted 3,610
Vested (5,462)
Forfeited (5,033)
Nonvested, end of period 675,462