Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
| Balance at beginning of period | $ 4,314 | $ 3,286 |
| Changes in estimates | (2) | 354 |
| Liabilities incurred | 290 | 335 |
| Liabilities settled | (67) | (8) |
| Acquisitions of properties | (83) | (385) |
| Asset Retirement Obligation, Sale of Properties | 0 | (310) |
| Accretion expense | 316 | 272 |
| Balance at end of period | $ 4,934 | $ 4,314 |
| X | ||||||||||
- Definition Asset Retirement Obligation, Accretion Expense Accrued No definition available.
|
| X | ||||||||||
- Definition Asset Retirement Obligation, Other No definition available.
|
| X | ||||||||||
- Definition Asset Retirement Obligation, Sale of Properties No definition available.
|
| X | ||||||||||
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of asset retirement obligations incurred during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|