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Stock-Based Compensation Plans and Employee Benefits - Activities for Unvested Restricted Stock Awards (Detail) - Restricted Stock [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of awards unvested, beginning balance | shares 322
Number of awards, Granted | shares 344
Number of awards, Spin-off adjustment | shares 69
Number of awards, Vested | shares (162)
Number of awards, Forfeited | shares (12)
Number of awards unvested, ending balance | shares 561
Weighted-Average Grant Date Fair Value unvested, beginning balance | $ / shares $ 23.45
Weighted-Average Grant Date Fair Value, Granted | $ / shares 13.01
Weighted-Average Grant Date Fair Value, Spin-off adjustment | $ / shares 0.00
Weighted-Average Grant Date Fair Value, Vested | $ / shares 24.50
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 22.31
Weighted-Average Grant Date Fair Value unvested, ending balance | $ / shares $ 16.77