XML 72 R56.htm IDEA: XBRL DOCUMENT v3.3.1.900
Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Outstanding beginning balance | shares 241,450
Options, Granted | shares 153,250
Options, Exercised | shares (114,616)
Options, Forfeited | shares (22,750)
Options, Outstanding ending balance | shares 257,334
Options, Exercisable | shares 33,834
Weighted-Average Exercise Price, Outstanding beginning balance | $ / shares $ 73.62
Weighted-Average Exercise Price, Granted | $ / shares 123.59
Weighted-Average Exercise Price, Exercised | $ / shares 65.65
Weighted-Average Exercise Price, Forfeited | $ / shares 118.50
Weighted-Average Exercise Price, Outstanding ending balance | $ / shares 102.96
Weighted-Average Exercise Price, Exercisable | $ / shares $ 73.89
Weighted-Average Remaining Contractual Term (in years), Outstanding 3 years 4 months 10 days
Weighted-Average Remaining Contractual Term (in years), Exercisable 1 year 6 months 11 days
Aggregate Intrinsic Value, Outstanding | $ $ 4,494
Aggregate Intrinsic Value, Exercisable | $ $ 1,491