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Equity Compensation Plans - Options (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
Sep. 30, 2017
USD ($)
$ / shares
shares
Shares  
Outstanding (shares) | shares 393
Exercisable (shares) | shares 214
Unvested (shares) | shares 179
Weighted- Average Exercise Price  
Outstanding (in dollars per share) | $ / shares $ 26.51
Exercisable (in dollars per share) | $ / shares 16.51
Unvested (in dollars per share) | $ / shares $ 38.41
Aggregate Intrinsic Value  
Outstanding | $ $ 12,350
Exercisable | $ 8,700
Unvested | $ $ 3,650