Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 4,602		$ 12,611		$ 16,557
Additions Due to acquisitions	246
Additions Charged to costs and expenses	6,841		3,441		2,117
Deductions	(7,693)		(11,450)		(6,063)
Balance at end of period	3,996		4,602		12,611
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	328		1,057		1,433
Additions Due to acquisitions	67
Additions Charged to costs and expenses	181		63		1,456
Deductions	(215)	[1]	(792)	[1]	(1,832)	[1]
Balance at end of period	361		328		1,057
Allowance for Sales Returns
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	4,274		11,554		15,124
Additions Due to acquisitions	179
Additions Charged to costs and expenses	6,660	[2]	3,378	[2]	661	[2]
Deductions	(7,478)	[3]	(10,658)	[3]	(4,231)	[3]
Balance at end of period	$ 3,635		$ 4,274		$ 11,554

[1] Uncollectible accounts written off, net of recoveries.

[2] Charged to net sales.

[3] Allowances granted.