XML 50 R40.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock Option Activity (Detail)
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Underlying Shares  
Outstanding at beginning of period | shares 6,687,150
Exercised | shares (10,000)
Outstanding at end of period | shares 6,677,150
Exercisable at end of year | shares 5,466,836
Weighted Average Exercise Price Per Share  
Outstanding at beginning of period | $ / shares $ 20.68
Exercised | $ / shares 22.29
Outstanding at end of period | $ / shares 20.68
Exercisable at end of year | $ / shares $ 21.02