Contingencies, Litigation and Commitments (Details) - Landfill lawsuits	6 Months Ended
Jun. 30, 2017 potentially_responsible_party lawsuit
Loss Contingencies [Line Items]
Number of potentially responsible parties \| potentially_responsible_party	1
Number of landfill lawsuits \| lawsuit	2

Number of pending claims pertaining to a loss contingency.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant