Commitments and Contingencies (Narrative) (Detail) - USD ($) $ in Thousands	Apr. 19, 2017	Jul. 03, 2017	Jun. 30, 2017	Dec. 31, 2016	Nov. 23, 2016	Nov. 22, 2016	Jul. 01, 2016	Jun. 29, 2016	Nov. 21, 2015	Nov. 20, 2015	Feb. 12, 2014
Guarantor Obligations [Line Items]
Purchase Obligation			$ 1,900
Litigation Settlement, Amount	$ 19,500
Total lease payments for the duration of the guarantee			50,800
Accrued lease liability			10,700	$ 10,700
Other Investments								$ 75,000
Guarantees, Fair Value Disclosure							$ 14,000
Anniversary payment		$ 89,000	89,000	88,001			$ 87,000
Next twelve months [Member]
Guarantor Obligations [Line Items]
Purchase Obligation			14,800
Next twenty-four months [Member] [Member]
Guarantor Obligations [Line Items]
Purchase Obligation			120,700
February 2018 Notes [Member]
Guarantor Obligations [Line Items]
Debt Instrument, Unamortized Discount			$ 2,654	$ 4,852	$ 4,600	$ 4,300			$ 14,100	$ 3,100	$ 29,700