Severance and Restructuring Charges - Schedule of Expenses, Cash Flows, and Accrued Liabilities Associated with Restructuring Actions (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Cash flow associated with restructuring actions			$ 107,000	$ 987,000
Accrued Liabilities associated with restructuring actions	$ 651,000		651,000		$ 758,000
Warehousing, Marketing and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Expenses associated with restructuring actions	0	$ 0	0	254,000
First Quarter 2015 Actions Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Cash flow associated with restructuring actions			107,000	487,000
Accrued Liabilities associated with restructuring actions	651,000		651,000		758,000
First Quarter 2015 Actions Facility Closure [Member]
Restructuring Cost And Reserve [Line Items]
Cash flow associated with restructuring actions				500,000
First Quarter 2015 Actions Facility Closure [Member] | Warehousing, Marketing and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Expenses associated with restructuring actions				254,000
Fourth Quarter 2015 Action Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Cash flow associated with restructuring actions			410,000	$ 6,462,000
Accrued Liabilities associated with restructuring actions	$ 1,014,000		$ 1,014,000		$ 1,424,000