Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Restricted Stock Activity (Detail)

v3.6.0.2
Stock-based Compensation - Restricted Stock Activity (Detail) - Restricted Stock
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Number Outstanding  
Nonvested shares, Beginning balance (in shares) | shares 594,637
Granted (in shares) | shares 128,737
Dividend equivalents (in shares) | shares 15,931
Vested (in shares) | shares (72,862)
Forfeited (in shares) | shares (43,751)
Nonvested shares, Ending balance (in shares) | shares 622,692
Weighted Average Grant Date Fair Value  
Nonvested shares, Beginning balance (in USD per share) | $ / shares $ 50.73
Granted (in USD per share) | $ / shares 61.66
Dividend equivalents (in USD per share) | $ / shares 59.85
Vested (in USD per share) | $ / shares 43.87
Forfeited (in USD per share) | $ / shares 58.83
Nonvested shares, Ending balance (in USD per share) | $ / shares $ 53.45