Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 28, 2018	Sep. 28, 2018	Sep. 28, 2018	Dec. 31, 2017	Sep. 29, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Incremental tax benefit received upon exercise of non-qualified employee stock options			$ 500		$ 2,100	$ 600
U.S. statutory income tax rate		21.00%	24.60%	35.00%	35.00%	35.00%
Recognized provisional net charge as component of income tax due to tax effects			$ 49,900
Remeasurement of deferred tax assets and liabilities based on rate at which expected to reverse in future			21.00%
Provisional amount recorded related to remeasurement of deferred tax balance			$ 7,200
Provisional amount for transition tax liability resulting in increase in income tax expense due to foreign tax effects			39,200
Reclassification of AOCI to retained earnings net tax benefit	$ 7,700		(7,682)		$ 0	$ 0
Provisional amount of tax expense on unremitted foreign earnings	3,500	$ 3,500	3,500
Undistributed foreign earnings	483,000	483,000	483,000
Unrecognized tax benefit within the next twelve months	800	800	800
U.S. Federal
Income Taxes [Line Items]
Deferred tax assets, capital loss carryforwards	106,800	106,800	$ 106,800
Deferred tax assets, capital loss carryforwards expiration start year			2020
Foreign
Income Taxes [Line Items]
Deferred tax assets, foreign net operating loss carryforwards	$ 45,400	$ 45,400	$ 45,400