Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) unit segment shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Accounting Policies [Abstract]
Number of reportable segments | segment	3
Advertising costs	$ 15,800	$ 15,300	$ 16,100
Asset impairments	$ 0	$ 205	$ 795
Number of reporting units | unit	13
Option to purchase common stock shares not included in the computation of diluted EPS (in shares) | shares	0	900,000	900,000
Engineering expense	$ 76,400	$ 68,800	$ 61,200
Research and development expense	42,400	39,400	33,600
Business Combination, Separately Recognized Transactions [Line Items]
Foreign currency transaction (gain) loss	$ 20,500	(6,200)	(100)
Percentage of concentration risk	2.00%
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other (income) expense - net	$ (2,394)	1,731	(3,009)
Selling, general and administrative expenses	(524,940)	(492,398)	(474,156)
SFC-Koenig
Business Combination, Separately Recognized Transactions [Line Items]
Foreign currency transaction (gain) loss	$ 20,200
Accounting Standards Update 2017-17 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other (income) expense - net		6,600	5,300
Selling, general and administrative expenses		$ 6,600	$ 5,300