Reconciliation of Debt Issuance Costs and Debt Discounts to the Net Carrying Value for Each Debt Obligation (Excluding Line of Credit Arrangements) (Detail) - USD ($) $ in Thousands	Oct. 07, 2017	Dec. 31, 2016	Sep. 28, 2016	Apr. 03, 2012
Debt Instrument [Line Items]
Face Value	$ 813,750	$ 817,500
Debt issuance costs and debt discount	7,719	8,770
Net carrying value	806,031	808,730
Other Notes Payable
Debt Instrument [Line Items]
Face Value	13,750	17,500
Debt issuance costs and debt discount	394	634
Net carrying value	13,356	16,866
2026 Notes
Debt Instrument [Line Items]
Face Value	400,000	400,000	$ 400,000
Debt issuance costs and debt discount	5,153	5,594
Net carrying value	394,847	394,406
2022 Notes
Debt Instrument [Line Items]
Face Value	400,000	400,000		$ 400,000
Debt issuance costs and debt discount	2,172	2,542
Net carrying value	$ 397,828	$ 397,458