Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail)	3 Months Ended
	Mar. 31, 2019
Level I [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Greater than or equal to $70,000,000
LIBO Rate Applicable Margin	1.25%
Base Rate Applicable Margin	0.25%
Level II [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Less than $70,000,000
LIBO Rate Applicable Margin	1.375%
Base Rate Applicable Margin	0.50%