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Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |  |
Beginning balance of Outstanding, Deferred Stock Units to be Settled in Shares |  | 76,023 | [1] | 90,642 | [1] | 116,952
Granted, Deferred Stock Units to be Settled in Shares |  | 0 |  | 0 |  | 2,928
Vested, Deferred Stock Units to be Settled in Shares |  | 0 |  | (14,619) |  | (19,492)
Forfeited, Deferred Stock Units to be Settled in Shares |  | 0 |  | 0 |  | (9,746)
Ending balance of Outstanding, Deferred Stock Units to be Settled in Shares | [1] | 76,023 |  | 76,023 |  | 90,642
Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit |  | $ 4.44 | [1] | $ 4.43 | [1] | $ 4.39
Granted, Weighted Average Grant-Date Fair Value Per Unit |  | 0 |  | 0 |  | 5.73
Vested, Weighted Average Grant-Date Fair Value Per Unit |  | 0 |  | 4.39 |  | 4.39
Forfeited, Weighted Average Grant-Date Fair Value Per Unit |  | 0 |  | 0 |  | 4.39
Ending balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit | [1] | $ 4.44 |  | $ 4.44 |  | $ 4.43
[1] | Includes vested but unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement.

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- 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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