Acquisitions (Details) $ in Thousands, € in Millions	Jan. 07, 2015 USD ($)	Jan. 07, 2015 EUR (€)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill			$ 1,240,187	$ 1,223,986
SIHI Group B.V.
Schedule of Equity Method Investments [Line Items]
Percentage acquired	100.00%
Business Combination, Consideration Transferred	$ 341,500	€ 286.7
Business Combination, Cash Consideration Transferred	110,000
Business Combination, Consideration Transferred from borrowed sources	255,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable	59,300
Inventories	74,000
Prepaid expenses and other	17,700
Total current assets	151,000
Intangible assets	78,600
Property, plant and equipment	94,500
Long-term deferred tax asset	11,700
Investments in affiliates	7,300
Total assets	343,100
Current liabilities	(88,000)
Noncurrent liabilities	(114,700)
Net assets	140,400
Goodwill	201,100
Purchase price, net of cash acquired of $23.4 million	341,500
Business Acquisition, Purchase Price, Net of Cash Acquired	$ 23,400
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years) (less than for one year)	9 years	9 years
SIHI Group B.V. | Trademarks
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 20,900
SIHI Group B.V. | Existing customer relationships
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 45,300
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years) (less than for one year)	10 years	10 years
SIHI Group B.V. | Backlog
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 8,500
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years) (less than for one year)	1 year	1 year
SIHI Group B.V. | Engineering drawings and other
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 3,900
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years) (less than for one year)	10 years	10 years