Selected Financial Statement Information - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, net:
Trade accounts receivable	$ 108,547		$ 120,066
Allowance for sales returns	(24,522)		(15,470)	$ (9,341)	$ (8,148)
Accrued variable consideration for sales program incentives	(7,041)		(5,424)
Allowance for doubtful accounts	(5,610)		(4,447)	$ (5,728)		$ (5,645)
Accounts receivable, net	71,374	$ 62,844	94,725
Inventories:
Raw materials	80,474		67,785
Work-in-process	815		868
Finished goods	256,768		193,833
Inventory	338,057		262,486
Property, plant and equipment, net:
Land	7,232		7,322
Buildings and improvements	75,070		71,692
Machinery and equipment	111,055		98,116
Furniture, computers and equipment	111,793		108,706
Production molds	4,804		19,604
Construction-in-process	17,026		10,665
Property, plant and equipment, gross	326,980		316,105
Accumulated depreciation	(238,508)		(245,878)
Property, plant and equipment, net	88,472		70,227
Accounts payable and accrued expenses:
Accounts payable	42,468		63,204
Accrued expenses	127,135		87,925
Accrued goods in-transit	39,050		24,998
Accounts payable and accrued expenses	208,653		176,127
Accrued employee compensation and benefits:
Accrued payroll and taxes	31,559		29,363
Accrued vacation and sick pay	10,606		9,781
Accrued commissions	1,007		1,029
Accrued employee compensation and benefits	$ 43,172		$ 40,173