Acquisitions - Schedule of Final Purchase Price Allocation for Fair Values of Assets Acquired and Liabilities Assumed (Detail) $ in Thousands, € in Millions	Dec. 31, 2017 USD ($)	Dec. 30, 2016 USD ($)	Dec. 30, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 30, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Excess purchase price over fair value of net assets acquired	$ 206,040			$ 188,841		$ 97,309
Stromag [Member]
Business Acquisition [Line Items]
Total purchase price, excluding acquisition costs of approximately $2.9 million	191,852	$ 196,700	€ 186.4
Cash and cash equivalents	8,758	$ 8,800			€ 8.3
Trade receivables	24,087
Inventories	22,039
Property, plant and equipment	40,343
Intangible assets	74,795
Prepaid expenses and other current assets	778
Total assets acquired	170,800
Accounts payable	(15,370)
Accrued payroll	(7,171)
Accrued expenses and other current liabilities	(4,496)
Income tax payable	(2,525)
Deferred tax liability	(27,783)
Other long-term liabilities	(1,255)
Pension liability	(15,283)
Total liabilities assumed	(73,883)
Net assets acquired	96,917
Excess purchase price over fair value of net assets acquired	$ 94,935