Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]
Number of business segments | segment	3
Net foreign currency transaction gains (losses) included in other expense	$ (100)	$ 1,800	$ 500
Revenue recognition, percentage of contract completion (percent)	70.00%
Accrued claims	$ 2,300	8,200
Income (loss) before income tax expense (benefit)	20,205	(36,618)	212,489
Retainages expected to be collected within one year	24,906	19,978
Long-term retainages, anticipated collection in 2017	0
Long-term retainages, anticipated collection in 2018	3,900
Research and development activities	$ 16,500	$ 18,500	21,000
Percentage of total inventories using LIFO method	20.00%	18.00%
LIFO reserve	$ 7,700	$ 7,900
Depreciation expense	23,500	22,300	18,500
Restricted cash and cash equivalents	37,100
Restricted cash and cash equivalents	37,144	26,311
Reserves for self-insurance	24,100	25,300
Contract Receivable Retainage, Year Four	$ 1,200
Maximum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Investment ownership in percentage	20.00%
Change in Assumptions for Pension Plans
Basis Of Presentation And Significant Accounting Policies [Line Items]
Increase in pension liability		$ 46,900
Research and Development Facilities and Equipment
Basis Of Presentation And Significant Accounting Policies [Line Items]
Impairment charge recognized	$ 14,600
Buildings | Minimum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Estimated economic useful life (years)	8 years
Buildings | Maximum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Estimated economic useful life (years)		33 years
Machinery and equipment | Minimum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Estimated economic useful life (years)	3 years
Machinery and equipment | Maximum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Estimated economic useful life (years)		28 years
Restricted Foreign Cash
Basis Of Presentation And Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	$ 3,700
Cash Held to Meet Reinsurance Reserve Requirements
Basis Of Presentation And Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	33,400
Global Services
Basis Of Presentation And Significant Accounting Policies [Line Items]
Contract losses	12,900
Global Services | Settled Litigation
Basis Of Presentation And Significant Accounting Policies [Line Items]
Income (loss) before income tax expense (benefit)	$ 9,600	$ 11,600	$ 35,600