Accounting Standards Adopted in Current Year - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 29, 2018	[1]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Tax Act from accumulated other comprehensive loss to retained earnings	$ 2,485	$ 2,485
Intra-Entity Transfers of Assets Other Than Inventory
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative adjustment to decrease retained earnings	$ 48,624

[1] Amounts in parentheses indicate debits