XML 55 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Closure and Post-Closure Liabilities | The changes to closure and post-closure liabilities (also referred to as "asset retirement obligations") from January 1, 2016 through December 31, 2017 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2016 | $ | 32,023 |  |  | $ | 24,226 |  |  | $ | 56,249 |
Liabilities assumed in acquisitions | — |  |  | 2,408 |  |  | 2,408 |
Measurement period adjustments from prior period acquisitions | — |  |  | 657 |  |  | 657 |
New asset retirement obligations | 1,983 |  |  | — |  |  | 1,983 |
Accretion | 2,705 |  |  | 2,398 |  |  | 5,103 |
Changes in estimates recorded to statement of operations | (1,415 | ) |  | (1,204 | ) |  | (2,619 | )
Changes in estimates recorded to balance sheet | (3,289 | ) |  | — |  |  | (3,289 | )
Expenditures | (1,446 | ) |  | (802 | ) |  | (2,248 | )
Currency translation and other | 69 |  |  | 18 |  |  | 87 |
Balance at December 31, 2016 | 30,630 |  |  | 27,701 |  |  | 58,331 |
Liabilities assumed in acquisitions | — |  |  | 59 |  |  | 59 |
Measurement period adjustments from prior period acquisitions | — |  |  | 596 |  |  | 596 |
New asset retirement obligations | 1,881 |  |  | — |  |  | 1,881 |
Adjustment related to disposition of business | — |  |  | (1,170 | ) |  | (1,170 | )
Accretion | 2,243 |  |  | 2,505 |  |  | 4,748 |
Changes in estimates recorded to statement of operations | (131 | ) |  | (109 | ) |  | (240 | )
Changes in estimates recorded to balance sheet | 364 |  |  | (591 | ) |  | (227 | )
Expenditures | (2,777 | ) |  | (448 | ) |  | (3,225 | )
Currency translation and other | 172 |  |  | 112 |  |  | 284 |
Balance at December 31, 2017 | $ | 32,382 |  |  | $ | 28,655 |  |  | $ | 61,037 |
Schedule of Expected Payments Related to Asset Retirement Obligations | Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
Year ending December 31, |
2018 | $ | 6,313 |
2019 | 8,957 |
2020 | 12,152 |
2021 | 8,652 |
2022 | 353 |
Thereafter | 285,404 |
Undiscounted closure and post-closure liabilities | 321,831 |
Less: Discount at credit-adjusted risk-free rate | (161,767 | )
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (99,027 | )
Present value of closure and post-closure liabilities | $ | 61,037 |

X
- Definition Schedule of Expected Payments Related to Asset Retirement Obligations [Table Text Block] + References No definition available. + Details
Name: | clh_ScheduleOfExpectedPaymentsRelatedToAssetRetirementObligationsTableTextBlock
Namespace Prefix: | clh_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration