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Activity in Nonvested Restricted Stock Unit Awards (Detail) (Restricted Stock Units, USD $)
12 Months Ended
Dec. 31, 2013
Restricted Stock Units
 
Share Based Compensation [Line Items]  
Number of shares outstanding, beginning balance 534,157
Number of options, granted 143,288
Number of shares, vested (107,177)
Number of shares, forfeited (59,782)
Number of shares outstanding, ending balance 510,486
Weighted average grant date fair value outstanding, beginning balance $ 85.17
Weighted average grant date fair value, granted $ 100.13
Weighted average grant date fair value, vested $ 87.16
Weighted average grant date fair value, forfeited $ 88.36
Weighted average grant date fair value outstanding, ending balance $ 89.58