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Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail) shares in Thousands | 3 Months Ended
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Mar. 31, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Beginning balance of Outstanding, Deferred Stock Units to be Settled in Shares | shares | 76 | [1]
Granted, Deferred Stock Units to be Settled in Shares | shares | 0 |
Vested, Deferred Stock Units to be Settled in Shares | shares | (3) | [2]
Forfeited, Deferred Stock Units to be Settled in Shares | shares | 0 |
Ending balance of Outstanding, Deferred Stock Units to be Settled in Shares | shares | 73 | [1]
Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit | $ / shares | $ 4.44 | [1]
Granted, Weighted Average Grant-Date Fair Value Per Unit | $ / shares | 0 |
Vested, Weighted Average Grant-Date Fair Value Per Unit | $ / shares | 5.56 | [2]
Forfeited, Weighted Average Grant-Date Fair Value Per Unit | $ / shares | 0 |
Ending balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit | $ / shares | $ 4.39 | [1]
[1] | Includes vested but unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement.
[2] | Includes previously vested awards which were released during the current period.

X
- Definition The number of equity-based deferred stock units that vested during the reporting period. + References No definition available. + Details
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- Definition The number of equity-based deferred stock units, that were forfeited during the reporting period. + References No definition available. + Details
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- Definition The number of grants made during the period for deferred stock units. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award deferred stock units grants in period weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award deferred stock units nonvested forfeited weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award deferred stock units unreleased number. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award deferred stock units unreleased weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award deferred stock units vested weighted average grant date fair value. + References No definition available. + Details
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