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Equity Method Investments - Reconciliation of Net Income to Equity in Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity income based on stated ownership percentages | $ 27,266 |  |  |  | $ 28,272 |  |  |  | $ 27,266 | $ 28,272 | $ 30,787
Timing of GAAP and other adjustments | (114) |  |  |  | 652 |  |  |  | (114) | 652 | (444)
Equity in income of investees | $ 7,905 | $ 8,271 | $ 4,913 | $ 6,063 | $ 6,506 | $ 7,874 | $ 6,862 | $ 7,682 | $ 27,152 | $ 28,924 | $ 30,343

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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