XML 77 R65.htm IDEA: XBRL DOCUMENT v3.10.0.1
STOCK BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units and Performance Based Restricted Stock Units
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 1,889,559
Granted (in shares) | shares 574,285
Vested (in shares) | shares (225,106)
Forfeited (in shares) | shares (367,860)
Ending balance (in shares) | shares 1,870,878
Weighted Average Grant Date Fair Value  
Outstanding, Beginning balance (usd per share) | $ / shares $ 14.84
Granted (usd per share) | $ / shares 24.06
Vested (usd per share) | $ / shares 15.31
Forfeited (usd per share) | $ / shares 16.59
Outstanding, Ending balance (usd per share) | $ / shares $ 17.10