Commitments and Contingencies (Narrative) (Detail) - USD ($) $ in Thousands					9 Months Ended
		Sep. 21, 2017	Apr. 19, 2017	Sep. 22, 2015	Sep. 30, 2017		Sep. 30, 2016	Oct. 27, 2017	Jul. 03, 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					$ 1,100
Premiums, Percentage Assumed to Net		1.00%
Proceeds from Collection of Notes Receivable				$ 21,400	8,142		$ 54,653
Accounts Receivable, Net, Noncurrent	[1]				1,400					$ 0
Litigation Settlement, Amount			$ 19,500
Receivables, Net, Current								$ 13,000
Total lease payments for the duration of the guarantee					47,900
Accrued lease liability					10,700					10,700
Other Investments															$ 75,000
Guarantees, Fair Value Disclosure														$ 14,000
Investments-other					0	[1]			$ 75,000	75,000	[1]
Anniversary payment					0	[1]			$ 89,000	88,001	[1]			$ 87,000
Next twelve months [Member]
Guarantor Obligations [Line Items]
Purchase Obligation					17,100
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					$ 1,525					$ 4,852		$ 4,600	$ 4,300			$ 14,100	$ 3,100	$ 29,700
kaleo Note Receivable [Member]
Guarantor Obligations [Line Items]
Proceeds from Collection of Notes Receivable		$ 141,700

[1] unaudited