Business Segments - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | Segment	2
Standard industry and generally require payment terms	30 days
Corporate and Other [Member] | Other Expense [Member]
Segment Reporting Information [Line Items]
Contractual settlement	$ 2,425
Pension and other post retirement benefit income	$ 1,100
Interest, fees and early termination costs		$ 367