Commitments, contingent liabilities and other matters - Future Commitments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Operating Leases
2016	$ 40,655
2017	36,673
2018	26,613
2019	21,789
2020	14,475
Thereafter	64,019
Total	204,224
Program Broadcast Contracts
Recorded Unconditional Purchase Obligation [Line Items]
2016	148,894
2017	202,329
2018	216,399
2019	130,793
2020	181
Thereafter	135
Total	698,731
Purchase Obligations
Recorded Unconditional Purchase Obligation [Line Items]
2016	64,376
2017	38,943
2018	28,297
2019	20,584
2020	9,543
Thereafter	14,063
Total	$ 175,806