XML 100 R87.htm IDEA: XBRL DOCUMENT v3.10.0.1
STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Restricted Stock, Restricted Stock Units and Performance Stock Units  
Restricted Stock, Restricted Stock Units, and Performance Stock Units  
Outstanding, beginning balance (in shares) 1,091
Granted (in shares) 230
Forfeited (in shares) (3)
Outstanding, ending balance (in shares) 686
Unvested, ending balance (in shares) 951
Weighted Average Grant Price  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 9.81
Granted (in dollars per share) | $ / shares 24.92
Forfeited (in dollars per share) | $ / shares 13.73
Outstanding, ending balance (in dollars per share) | $ / shares 15.56
Weighted average grant price, unvested, ending balance (in dollars per share) | $ / shares $ 15.95
Weighted average remaining contractual term, outstanding 1 year 2 months 3 days
Weighted average remaining contractual term, unvested 1 year 3 months
Aggregate intrinsic value, outstanding | $ $ 8,877
Aggregate intrinsic value, unvested | $ $ 11,929
Performance Stock Units  
Weighted Average Grant Price  
Attainment level percentage 100.00%
Class A Common Stock | Restricted Stock, Restricted Stock Units and Performance Stock Units  
Restricted Stock, Restricted Stock Units, and Performance Stock Units  
Vested (in shares) (632)
Weighted Average Grant Price  
Vested (in dollars per share) | $ / shares $ 9.04
Class A Common Stock | Performance Stock Units  
Weighted Average Grant Price  
Additional issuance if performance targets met (in shares) 265
Additional shares issued (in shares) 185