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Activity in Other Nonvested Restricted Stock Unit Awards (Detail) - Restricted Stock Units
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares outstanding, beginning balance | shares 406,533
Number of shares, granted | shares 99,240
Number of shares, vested | shares (79,750)
Number of shares, forfeited | shares (23,933)
Number of shares outstanding, ending balance | shares 402,090
Weighted average grant date fair value outstanding, beginning balance | $ / shares $ 115.30
Weighted average grant date fair value, granted | $ / shares 200.12
Weighted average grant date fair value, vested | $ / shares 96.65
Weighted average grant date fair value, forfeited | $ / shares 139.71
Weighted average grant date fair value outstanding, ending balance | $ / shares $ 138.47