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Goodwill and Intangible Assets - Schedule of Activity and Balances Related to Goodwill by Operating Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Line Items]
Goodwill, beginning balance	$ 118,976
Acquisitions	923
Goodwill, ending balance	119,899
Eastern Region [Member]
Goodwill [Line Items]
Goodwill, beginning balance	17,429
Goodwill, ending balance	17,429
Western Region [Member]
Goodwill [Line Items]
Goodwill, beginning balance	87,503
Acquisitions	923
Goodwill, ending balance	88,426
Recycling [Member]
Goodwill [Line Items]
Goodwill, beginning balance	12,315
Goodwill, ending balance	12,315
Other [Member]
Goodwill [Line Items]
Goodwill, beginning balance	1,729
Goodwill, ending balance	$ 1,729

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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