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Stockholders' Deficit - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended														8 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	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	Dec. 31, 2014	Dec. 31, 2015	Apr. 30, 2014	Apr. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from equity method investments																$ 0	$ 0	$ (936)	$ (4,441)
Loss on derivative instruments																(225)	(227)	(280)	(4,512)
Loss from continuing operations before income taxes and discontinued operations																(5,107)	(10,430)	(25,511)	(52,509)
Benefit for income taxes																703	1,351	1,799	(2,526)
Loss from continuing operations before discontinued operations	$ (5,987)	$ (7,019)	$ 2,296	$ 1,025	$ (9,271)	$ 259	$ (290)	$ (11,815)	$ (10,750)	$ (294)	$ (142)	$ (9,696)	$ (11,079)	$ (20,732)	$ (8,155)	$ (5,810)	$ (11,781)	(27,310)	(49,983)
Commodity Hedges [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from continuing operations before income taxes and discontinued operations																		(405)	(4,247)
Benefit for income taxes																		(250)
Loss from continuing operations before discontinued operations																		(655)	(4,247)
Commodity Hedges [Member] | Commodity Contract [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | GreenFiber Commodity Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss from equity method investments																		$ (405)	(621)
Commodity Hedges [Member] | Interest Rate Contracts [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on derivative instruments																			$ (3,626)

X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher SEC
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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