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Earnings Per Share - Schedule of Numerator and Denominator Used in Computation of Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	8 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Numerator:
Loss from continuing operations before discontinued operations attributable to common stockholders	$ (6,018)us-gaap_IncomeLossFromContinuingOperations	$ (3,629)us-gaap_IncomeLossFromContinuingOperations	$ (23,001)us-gaap_IncomeLossFromContinuingOperations	$ (49,662)us-gaap_IncomeLossFromContinuingOperations	$ (77,697)us-gaap_IncomeLossFromContinuingOperations
Number of shares outstanding, end of period:
Unvested restricted stock	(159,000)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable		(130,000)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable	(134,000)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable	(127,000)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable
Effect of weighted average shares outstanding during the period	(154,000)us-gaap_WeightedAverageNumberOfSharesIssuedBasic		(124,000)us-gaap_WeightedAverageNumberOfSharesIssuedBasic	(5,501,000)us-gaap_WeightedAverageNumberOfSharesIssuedBasic	(103,000)us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Weighted average common shares outstanding - basic and diluted	40,262,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	39,774,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	39,820,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	34,015,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	26,749,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Class A Common Stock [Member]
Number of shares outstanding, end of period:
Common stock shares outstanding	39,587,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember		39,086,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	38,662,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	25,991,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	25,589,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B Common Stock [Member]
Number of shares outstanding, end of period:
Common stock shares outstanding	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember		988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Publisher SEC

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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