Goodwill & Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized intangible assets:
Gross carrying amount	$ 944,301	$ 979,778
Accumulated amortization	226,953	145,773
Net carrying amount	717,348	834,005
Goodwill	560,215	914,331
Total	736,588	1,092,890
Mastheads
Non-amortized intangible assets:
Nonamortized intangible assets	176,373	178,559
Advertiser relationships
Amortized intangible assets:
Gross carrying amount	496,062	534,161
Accumulated amortization	111,782	75,363
Net carrying amount	384,280	458,798
Other customer relationships
Amortized intangible assets:
Gross carrying amount	112,704	109,674
Accumulated amortization	24,561	14,303
Net carrying amount	88,143	95,371
Subscriber relationships
Amortized intangible assets:
Gross carrying amount	265,218	259,391
Accumulated amortization	67,469	44,878
Net carrying amount	197,749	214,513
Other intangible assets
Amortized intangible assets:
Gross carrying amount	70,317	76,552
Accumulated amortization	23,141	11,229
Net carrying amount	$ 47,176	$ 65,323