Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning balance of Outstanding Shares	0
Granted, Shares	116,952
Vested, Shares	0
Forfeited, Shares	0
Ending balance of Outstanding Shares	116,952
Beginning balance of Weighted Average Grant-Date Fair Value Per Unit	$ 0
Granted, Weighted Average Grant-Date Fair Value Per Unit	$ 4.39
Vested, Weighted Average Grant-Date Fair Value Per Unit	$ 0
Forfeited, Weighted Average Grant-Date Fair Value Per Unit	$ 0
Ending balance of Weighted Average Grant-Date Fair Value Per Unit	$ 4.39

The number of equity-based deferred stock units, that were forfeited during the reporting period.

No definition available.

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The number of grants made during the period for deferred stock units.

No definition available.

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Share Based Compensation Arrangement By Share Based Payment Award Deferred Stock Units Grants In Period Weighted Average Grant Date Fair Value

No definition available.

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Share Based Compensation Arrangement By Share Based Payment Award Deferred Stock Units Nonvested Forfeited Weighted Average Grant Date Fair Value

No definition available.

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The number of non-vested equity-based payment deferred stock units that validly exist and are outstanding as of the balance sheet date.

No definition available.

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Share Based Compensation Arrangement By Share Based Payment Award Deferred Stock Units Nonvested Weighted Average Grant Date Fair Value

No definition available.

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Share Based Compensation Arrangement By Share Based Payment Award Deferred Stock Units Vested Weighted Average Grant Date Fair Value

No definition available.

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The number of equity-based deferred stock units that vested during the reporting period.

No definition available.

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