Other matters - Future Commitments (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Operating Leases
2017	$ 42,971
2018	35,764
2019	25,172
2020	19,255
2021	18,236
Thereafter	117,111
Total	258,509
Program Broadcast Contracts
Recorded Unconditional Purchase Obligation [Line Items]
2017	376,623
2018	431,104
2019	336,191
2020	210,960
2021	535
Thereafter	944
Total	1,356,357
Purchase Obligations
Recorded Unconditional Purchase Obligation [Line Items]
2017	70,881
2018	53,043
2019	15,460
2020	10,387
2021	8,557
Thereafter	6,352
Total	$ 164,680