Contingencies - Additional Information (Details) $ in Thousands				1 Months Ended	6 Months Ended							12 Months Ended		36 Months Ended
	Mar. 08, 2017 USD ($)	Feb. 09, 2017 USD ($)	Oct. 06, 2016 USD ($) policy	Aug. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) LegalMatter	Jun. 30, 2017 USD ($) LegalMatter	Jun. 30, 2017 USD ($) LegalMatter	Jun. 30, 2017 USD ($) LegalMatter Vendor	Jun. 30, 2017 USD ($) LegalMatter category	Jun. 30, 2016 USD ($)	Dec. 31, 2010 policy	Dec. 31, 2009 policy	Dec. 31, 2015 USD ($) LegalMatter	Dec. 31, 2016 USD ($) LegalMatter
Loss Contingencies [Line Items]
Number of main categories of product liability claims | category										2
Cumulative trauma liability claims, term						3 years
Loss contingency, years of activity						5 years
Number of insurance carriers							3		20
Insurance receivables						$ 108,600	$ 108,600	$ 108,600	$ 108,600	$ 108,600				$ 229,500	$ 159,900
Insurance receivables, current						7,400	7,400	7,400	7,400	7,400					2,000
Insurance receivables, noncurrent						101,200	101,200	101,200	101,200	101,200					157,900
Notes receivable from insurance companies						78,000	78,000	78,000	78,000	78,000				$ 8,700	67,300
Notes receivable from insurance companies, current						14,161	14,161	14,161	14,161	14,161					4,180
Notes receivable from insurance companies, noncurrent						63,833	63,833	63,833	63,833	63,833					63,147
Attorneys' fees		$ 11,800
Payment received pursuant to insurance policies	$ 80,900
Single Incident
Loss Contingencies [Line Items]
Product liability accrual						$ 3,500	$ 3,500	3,500	$ 3,500	$ 3,500					$ 3,400
Product liability expense								$ 200			$ 300
Lawsuit
Loss Contingencies [Line Items]
Number of lawsuits | LegalMatter						1,472	1,472	1,472	1,472	1,472				1,988	1,794
Damages from Product Defects
Loss Contingencies [Line Items]
Number of lawsuits | LegalMatter						2,831	2,831	2,831	2,831	2,831				3,779	3,023
Cumulative Trauma
Loss Contingencies [Line Items]
Product liability accrual						$ 93,100	$ 93,100	$ 93,100	$ 93,100	$ 93,100
Product liability expense								97,600						$ 150,900
Uninsured Cumulative Trauma
Loss Contingencies [Line Items]
Product liability expense								29,600			$ 300
Other Current Liabilities | Cumulative Trauma
Loss Contingencies [Line Items]
Product liability accrual						57,300	57,300	57,300	57,300	57,300					$ 11,100
Other Noncurrent Liabilities | Cumulative Trauma
Loss Contingencies [Line Items]
Product liability accrual						35,800	35,800	35,800	35,800	35,800
North River Insurance Company
Loss Contingencies [Line Items]
Litigation settlement amount, awarded to (against)			$ 10,900
Gain contingency, number of policies allegedly breached | policy			3									3	1
Damages awarded		46,900
Pre-judgment interest		5,100
North River Insurance Company | Punitive Damages
Loss Contingencies [Line Items]
Damages awarded		$ 30,000
Settled Litigation | Scenario, Forecast
Loss Contingencies [Line Items]
Payments to resolve cumulative trauma claims					$ 25,200
Settled Litigation | Scenario, Forecast | Couch claim
Loss Contingencies [Line Items]
Payments to resolve cumulative trauma claims				$ 75,200
Pending Litigation [Member] | Cumulative Trauma
Loss Contingencies [Line Items]
Estimated indemnity for all other remaining asserted cumulative trauma product liability claims						$ 17,900	$ 17,900	$ 17,900	$ 17,900	$ 17,900