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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2014
Assets:
Restricted assets	$ 2,251	$ 6,632	$ 681
Restricted Assets - Capital Projects [Member]
Assets:
Restricted assets	1,348	5,819
Restricted Assets - Landfill Closure [Member]
Assets:
Restricted assets	903	813	681
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Restricted assets	2,251	6,632
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Restricted Assets - Capital Projects [Member]
Assets:
Restricted assets	1,348	5,819
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Restricted Assets - Landfill Closure [Member]
Assets:
Restricted assets	903	813	681
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Interest rate derivative	$ 178	$ 1,668	$ 2,770

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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