Recent Accounting Standards - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded effects of the Act	$ 556
Increase in cash flows			$ 157,885	$ (188,412)	[1]
ASU 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash flows				4,500
Operating Income [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of net periodic benefit income		$ 111		154
Other Income [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of net periodic benefit income		$ (111)		$ (154)

[1] The Condensed Consolidated Statement of Cash Flows for the six months ended July 1, 2017 has been adjusted to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The Condensed Consolidated Statements of Cash Flows reflects the changes during the periods in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash activity is included with cash when reconciling the beginning-of-period and end-of-period total amounts shown. Refer to Note 1 for further discussion.