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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
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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 | $ 85,646 us-gaap_Revenues | $ 141,341 us-gaap_Revenues | $ 141,387 us-gaap_Revenues | $ 118,927 us-gaap_Revenues | $ 117,852 us-gaap_Revenues | $ 132,296 us-gaap_Revenues | $ 128,558 us-gaap_Revenues | $ 108,694 us-gaap_Revenues | $ 112,167 us-gaap_Revenues | $ 116,836 us-gaap_Revenues | $ 117,638 us-gaap_Revenues | $ 106,375 us-gaap_Revenues | $ 111,520 us-gaap_Revenues | $ 125,989 us-gaap_Revenues | $ 124,066 us-gaap_Revenues | $ 368,374 us-gaap_Revenues | $ 340,069 us-gaap_Revenues |  | $ 497,633 us-gaap_Revenues |  | $ 455,335 us-gaap_Revenues |  | $ 467,950 us-gaap_Revenues
Operating income (loss) | 2,708 us-gaap_OperatingIncomeLoss | 10,064 us-gaap_OperatingIncomeLoss | 9,338 us-gaap_OperatingIncomeLoss | (5,973)us-gaap_OperatingIncomeLoss | (1,298)us-gaap_OperatingIncomeLoss | 9,450 us-gaap_OperatingIncomeLoss | 9,737 us-gaap_OperatingIncomeLoss | 2,110 us-gaap_OperatingIncomeLoss | 78 us-gaap_OperatingIncomeLoss | 4,426 us-gaap_OperatingIncomeLoss | 5,807 us-gaap_OperatingIncomeLoss | (37,679)us-gaap_OperatingIncomeLoss | 4,448 us-gaap_OperatingIncomeLoss | 11,730 us-gaap_OperatingIncomeLoss | 10,468 us-gaap_OperatingIncomeLoss | 22,110 us-gaap_OperatingIncomeLoss | 21,891 us-gaap_OperatingIncomeLoss |  | 11,916 us-gaap_OperatingIncomeLoss |  | 12,421 us-gaap_OperatingIncomeLoss |  | (11,033)us-gaap_OperatingIncomeLoss
Net (loss) income | (6,017)us-gaap_ProfitLoss | 361 us-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 | 259 us-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 | $ 259 us-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 | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to common stockholders | $ (0.15)us-gaap_EarningsPerShareBasic | $ 0.01 us-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 | $ 0.00 us-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 | $ 0.00 us-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 | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to common stockholders | $ (0.15)us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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