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Stock Incentive Plans - Summary of Activity for Restricted Stock Units, Long-Term Incentive Awards and Non-Employee Director Stock Compensation (Detail) - Restricted Stock Unit [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Summary of activity for restricted stock units, long-term incentive awards and non-employee director stock compensation  
Number of Shares - Nonvested at December 31, 2016 | shares 1,414
Number of Shares - Granted | shares 70
Number of Shares - Vested | shares (737)
Number of Shares - Canceled or expired | shares 0
Number of Shares - Nonvested at June 30, 2017 | shares 747
Weighted Average Grant Date Fair Value - Nonvested at December 31, 2016 | $ / shares $ 1.79
Weighted Average Grant Date Fair Value - Granted | $ / shares 2.01
Weighted Average Grant Date Fair Value - Vested | $ / shares 1.83
Weighted Average Grant Date Fair Value - Canceled or expired | $ / shares 0
Weighted Average Grant Date Fair Value - Nonvested at June 30, 2017 | $ / shares $ 1.77