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Goodwill and intangible assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 830,592 | $ 852,152
Accumulated amortization | 637,583 | 588,481
Net carrying amount | 193,009 | 263,671
Indefinite-lived intangible assets: |  |
Total intangible assets | 357,083 | 430,374
Goodwill | 518,694 | 530,028
Mastheads |  |
Indefinite-lived intangible assets: |  |
Non-amortized intangible assets | 164,074 | 166,703
Advertiser relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 434,850 | 445,356
Accumulated amortization | 306,264 | 279,176
Net carrying amount | 128,586 | 166,180
Other customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 88,601 | 89,106
Accumulated amortization | 65,366 | 59,198
Net carrying amount | 23,235 | 29,908
Subscriber relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 240,271 | 250,820
Accumulated amortization | 199,152 | 183,895
Net carrying amount | 41,119 | 66,925
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 66,870 | 66,870
Accumulated amortization | 66,801 | 66,212
Net carrying amount | $ 69 | $ 658

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