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Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($) shares	Sep. 30, 2015 USD ($)
Loss Contingencies [Line Items]
Period of time to achieve earnings and cash building targets		6 months
Accrued bonus liability	$ 10.7	$ 10.7
Total estimated expense		$ 5.2
Common Stock
Loss Contingencies [Line Items]
Issued (in shares) | shares	2,158,436

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Deferred Compensation Arrangement with Individual, Minimum Period Financial Metrics Must Be Met

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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