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Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	2 Months Ended	3 Months Ended														8 Months Ended		12 Months Ended
	Dec. 31, 2014	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Apr. 30, 2014	Dec. 31, 2013	Apr. 30, 2013	Dec. 31, 2012	Apr. 30, 2012
Text Block [Abstract]
Revenues	$ 85,646us-gaap_Revenues	$ 141,341us-gaap_Revenues	$ 141,387us-gaap_Revenues	$ 118,927us-gaap_Revenues	$ 117,852us-gaap_Revenues	$ 132,296us-gaap_Revenues	$ 128,558us-gaap_Revenues	$ 108,694us-gaap_Revenues	$ 112,167us-gaap_Revenues	$ 116,836us-gaap_Revenues	$ 117,638us-gaap_Revenues	$ 106,375us-gaap_Revenues	$ 111,520us-gaap_Revenues	$ 125,989us-gaap_Revenues	$ 124,066us-gaap_Revenues	$ 368,374us-gaap_Revenues	$ 340,069us-gaap_Revenues		$ 497,633us-gaap_Revenues		$ 455,335us-gaap_Revenues		$ 467,950us-gaap_Revenues
Operating income (loss)	2,708us-gaap_OperatingIncomeLoss	10,064us-gaap_OperatingIncomeLoss	9,338us-gaap_OperatingIncomeLoss	(5,973)us-gaap_OperatingIncomeLoss	(1,298)us-gaap_OperatingIncomeLoss	9,450us-gaap_OperatingIncomeLoss	9,737us-gaap_OperatingIncomeLoss	2,110us-gaap_OperatingIncomeLoss	78us-gaap_OperatingIncomeLoss	4,426us-gaap_OperatingIncomeLoss	5,807us-gaap_OperatingIncomeLoss	(37,679)us-gaap_OperatingIncomeLoss	4,448us-gaap_OperatingIncomeLoss	11,730us-gaap_OperatingIncomeLoss	10,468us-gaap_OperatingIncomeLoss	22,110us-gaap_OperatingIncomeLoss	21,891us-gaap_OperatingIncomeLoss		11,916us-gaap_OperatingIncomeLoss		12,421us-gaap_OperatingIncomeLoss		(11,033)us-gaap_OperatingIncomeLoss
Net (loss) income	(6,017)us-gaap_ProfitLoss	361us-gaap_ProfitLoss	(154)us-gaap_ProfitLoss	(15,633)us-gaap_ProfitLoss	(11,033)us-gaap_ProfitLoss	(575)us-gaap_ProfitLoss	(163)us-gaap_ProfitLoss	(13,518)us-gaap_ProfitLoss	(11,474)us-gaap_ProfitLoss	(21,092)us-gaap_ProfitLoss	(8,379)us-gaap_ProfitLoss	(49,130)us-gaap_ProfitLoss	(24,635)us-gaap_ProfitLoss	(765)us-gaap_ProfitLoss	(3,062)us-gaap_ProfitLoss	(5,810)us-gaap_ProfitLoss	(4,078)us-gaap_ProfitLoss	(27,404)us-gaap_ProfitLoss	(27,404)us-gaap_ProfitLoss	(54,463)us-gaap_ProfitLoss	(54,463)us-gaap_ProfitLoss	(77,592)us-gaap_ProfitLoss	(77,592)us-gaap_ProfitLoss
(Loss) income attributable to common stockholders from continuing operations	(5,987)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	259us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(290)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(11,815)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(10,750)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(294)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(142)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(9,696)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(11,079)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(20,732)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(8,155)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(48,985)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(24,517)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(693)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(3,502)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(5,810)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	(3,984)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest		(27,310)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest		(49,983)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest		(77,703)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net (loss) income attributable to common stockholders	$ (5,987)us-gaap_NetIncomeLoss	$ 259us-gaap_NetIncomeLoss	$ (290)us-gaap_NetIncomeLoss	$ (11,815)us-gaap_NetIncomeLoss	$ (10,750)us-gaap_NetIncomeLoss	$ (339)us-gaap_NetIncomeLoss	$ (191)us-gaap_NetIncomeLoss	$ (13,397)us-gaap_NetIncomeLoss	$ (11,407)us-gaap_NetIncomeLoss	$ (20,967)us-gaap_NetIncomeLoss	$ (8,371)us-gaap_NetIncomeLoss	$ (49,124)us-gaap_NetIncomeLoss	$ (24,635)us-gaap_NetIncomeLoss	$ (765)us-gaap_NetIncomeLoss	$ (3,062)us-gaap_NetIncomeLoss	$ (6,018)us-gaap_NetIncomeLoss	$ (3,723)us-gaap_NetIncomeLoss		$ (23,095)us-gaap_NetIncomeLoss		$ (54,142)us-gaap_NetIncomeLoss		$ (77,586)us-gaap_NetIncomeLoss
Basic:
(Loss) income attributable to common stockholders from continuing operations	$ (0.15)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.01us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Net (loss) income attributable to common stockholders	$ (0.15)us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic
Basic and diluted:
Loss attributable to common stockholders from continuing operations				$ (0.30)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.25)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.67)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.30)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (1.82)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.91)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.15)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.09)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare		$ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare		$ (1.46)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare		$ (2.90)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Net loss attributable to common stockholders				$ (0.30)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.27)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.01)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.00us-gaap_EarningsPerShareBasicAndDiluted	$ (0.34)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.29)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.68)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.31)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.83)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.92)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.03)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.12)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.09)us-gaap_EarningsPerShareBasicAndDiluted		$ (0.58)us-gaap_EarningsPerShareBasicAndDiluted		$ (1.59)us-gaap_EarningsPerShareBasicAndDiluted		$ (2.90)us-gaap_EarningsPerShareBasicAndDiluted
Diluted:
(Loss) income attributable to common stockholders from continuing operations	$ (0.15)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.01us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net (loss) income attributable to common stockholders	$ (0.15)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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