Quarterly Results of Operations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes	$ 49,100	$ 17,500	$ 41,200	$ 8,300	$ 9,600	$ 7,400	$ 800	$ (2,500)	$ 116,100	$ 15,325	$ (23,909)
Non-cash Deferred Income Tax Benefit | Deferred Income Tax Liability | U.S. Federal Corporate Income Tax Rate
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes	37,500
Kronos | Non-US | Transition Tax
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes	(15,100)
Kronos | European Subsidiaries | Undistributed Earnings
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes	(900)
Kronos | Deferred Income Tax Asset Valuation Allowance | Germany and Belgium | Non-cash Deferred Income Tax Benefit
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes	3,200			$ 1,000
Kronos | Deferred Income Tax Asset Valuation Allowance | Germany and Belgium | Current Periods Net Operating Loss Utilization | Non-cash Deferred Income Tax Benefit
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes		1,500			900		$ (600)
Kronos | Deferred Income Tax Asset Valuation Allowance | Germany and Belgium | Expected Future Periods Net Operating Loss Utilization | Non-cash Deferred Income Tax Benefit
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes			$ 31,100
Kronos | Deferred Income Tax Asset Valuation Allowance | One Non US Subsidiary | Expected Future Periods Net Operating Loss Utilization | Non-cash Deferred Income Tax Benefit
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes	$ 3,700
Kronos | Insurance Settlement Gains
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes								$ 300
Kronos | Execution and Finalization of Agreement | US-Canada APA
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes					(400)	$ 1,100
Kronos | Execution and Finalization of Agreement | Canada-Germany APA
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes		2,200
Kronos | Increase (Decrease) in Uncertain Tax Positions
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes					$ (500)
Kronos | Loss on Prepayment of Debt
Effect Of Fourth Quarter Events [Line Items]
Income (loss), net of income taxes		$ (900)