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Supplemental Information to Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Mar. 31, 2020 | [2] | Sep. 30, 2019 | Jun. 30, 2019 | [2] | Mar. 31, 2019 | [2] | Sep. 30, 2020 | Sep. 30, 2019
Schedule Of Cash Flow Supplemental [Line Items] |  |  |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  |  |  | $ 53,364 | $ 56,326
Cash paid (refunds received) for income taxes, net |  |  |  |  |  |  |  | (108,776) | 69,498
Noncash investing and financing activities: |  |  |  |  |  |  |  |  |
Change in accounts payable and accrued expenses for the acquisition of theatre properties and equipment | [1] |  |  |  |  |  |  | (7,933) | (13,642)
Investment in NCM – receipt of common units (see Note 9) |  |  |  |  |  |  |  | 3,620 | 1,552
Dividends accrued on unvested restricted stock unit awards |  |  | $ (256) | $ (189) | [2] | $ (189) | $ (108) | (257) | (486)
NCM |  |  |  |  |  |  |  |  |
Noncash investing and financing activities: |  |  |  |  |  |  |  |  |
Interest expense - NCM (see Note 9) |  | $ (5,901) |  | $ (4,666) |  |  |  | $ (17,726) | $ (14,180)
[1] | Additions to theatre properties and equipment included in accounts payable as of September 30, 2020 and December 31, 2019 were $7,058 and $14,991, respectively.
[2] | Below is a summary of dividends paid to stockholders as well as dividends accrued on unvested restricted stock units during the nine months ended September 30, 2020 and 2019

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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