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Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Detail)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Vested, Number of Units (412,938)
Management Incentive Plan [Member] | TSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance 598,024
Granted, Number of Units 281,085 [1]
Forfeited, Number of Units (38,151)
Vested, Number of Units (391,321)
Outstanding, Number of Units, Ending Balance 449,637
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 11.35 [2]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 6.92 [2]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 11.13 [2]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 8.66 [2]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 10.94 [2]
Management Incentive Plan [Member] | PSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance 393,500
Granted, Number of Units 11,500 [3]
Forfeited, Number of Units (22,750)
Vested, Number of Units 0
Outstanding, Number of Units, Ending Balance 382,250
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 8.14 [2]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 5.12 [2],[3]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 7.59 [2]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [2]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 8.08 [2]
[1] The aggregate grant date fair value of TSUs issued for the six months ended June 30, 2019 was $1.9 million based on a grant date market price ranging from $6.90 to $8.70 per share.
[2] Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.
[3] The aggregate grant date fair value of PSUs issued for the six months ended June 30, 2019 was less than $0.1 million based on a calculated fair value price ranging from $2.80 to $6.76 per share.