Goodwill and intangible assets - Schedule of goodwill and intangible assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets
Gross carrying amount	$ 880,990	$ 878,376
Accumulated amortization	356,019	333,421
Net carrying amount	524,971	544,955
Indefinite-lived intangible assets:
Total intangible assets	694,521	713,153
Goodwill	540,894	533,709
Mastheads
Indefinite-lived intangible assets:
Non-amortized intangible assets	169,550	168,198
Advertiser relationships
Finite-Lived Intangible Assets
Gross carrying amount	455,522	453,038
Accumulated amortization	163,594	153,988
Net carrying amount	291,928	299,050
Other customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	102,798	102,486
Accumulated amortization	37,920	35,237
Net carrying amount	64,878	67,249
Subscriber relationships
Finite-Lived Intangible Assets
Gross carrying amount	253,890	254,162
Accumulated amortization	106,986	99,905
Net carrying amount	146,904	154,257
Other intangible assets
Finite-Lived Intangible Assets
Gross carrying amount	68,780	68,690
Accumulated amortization	47,519	44,291
Net carrying amount	$ 21,261	$ 24,399