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Stock-Based Compensation - Deferred Stock Unit, Performance-Based Stock Unit and Restricted Stock Activity (Detail) - Restricted Stock Unit And Performance Stock Unit And Deferred Stock Unit [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Unvested, shares    
Unvested, Beginning Balance 777 1,005
Granted 31 54
Vested (107) (121)
Forfeited (414) (161)
Unvested, Ending Balance 287 777
Weighted Average Grant Date Fair Value    
Unvested, Beginning Balance $ 14.08 $ 14.21
Granted 12.12 9.47
Vested 11.79 12.87
Forfeited 14.28 14.21
Unvested ,Ending Balance $ 14.44 $ 14.08