Other matters - Future Commitments (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leases
2019	$ 10,443
2020	9,938
2021	11,680
2022	10,861
2023	10,322
Thereafter	73,933
Total	127,177
Programming Contracts
Recorded Unconditional Purchase Obligation [Line Items]
2019	480,379
2020	398,050
2021	124,501
2022	133,980
2023	120,702
Thereafter	310
Total	1,257,922
Purchase Obligations
Recorded Unconditional Purchase Obligation [Line Items]
2019	72,637
2020	34,374
2021	4,908
2022	1,040
2023	336
Thereafter	0
Total	$ 113,295