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Severance and Restructuring Charges - Schedule of Expenses, Cash Flows, and Liabilities Associated with Restructuring Actions (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Expense associated with restructuring actions	$ (548)	$ 56,335
Cash flow associated with restructuring actions		9,930	$ 410
Liabilities associated with restructuring actions	13,539	13,539		$ 1,581
Restructuring Charges [Member]
Restructuring Cost And Reserve [Line Items]
Expense associated with restructuring actions	8,019	22,619
Cash flow associated with restructuring actions		9,827
Liabilities associated with restructuring actions	12,614	12,614
2018 Actions Product Assortment Refinement [Member] \| Cost of Goods Sold [Member]
Restructuring Cost And Reserve [Line Items]
Expense associated with restructuring actions	(8,554)	34,269
2018 Actions Workforce Reduction [Member] \| Restructuring Charges [Member]
Restructuring Cost And Reserve [Line Items]
Expense associated with restructuring actions	(152)	11,436
Cash flow associated with restructuring actions		2,592
Liabilities associated with restructuring actions	8,844	8,844
2018 Actions Facility Closure [Member] \| Restructuring Charges [Member]
Restructuring Cost And Reserve [Line Items]
Expense associated with restructuring actions	8,171	11,183
Cash flow associated with restructuring actions		7,235
Liabilities associated with restructuring actions	3,770	3,770
Fourth Quarter 2015 Actions Workforce Reduction [Member] \| Warehousing, Marketing and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Expense associated with restructuring actions	(13)	(553)
Cash flow associated with restructuring actions		103	316
Liabilities associated with restructuring actions	261	261		917
First Quarter 2015 Actions Workforce Reduction [Member] \| Warehousing, Marketing and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Cash flow associated with restructuring actions			$ 94
Liabilities associated with restructuring actions	$ 664	$ 664		$ 664