Balance Sheet Components - Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Balance Sheet Related Disclosures [Abstract]
Accrued payroll and benefits	$ 39,621	$ 41,827
Accrued sales rebate	8,333	8,358
Accrued sales tax and value added tax	5,253	7,052
Accrued sales and marketing expenses	4,088	3,508
Accrued warranty	4,050	3,177
Accrued accounts payable	2,866	3,048
Accrued professional fees	2,349	654
Unclaimed merger consideration	1,575	4,026
Accrued income taxes	572	426
Other	5,540	4,524
Total current accrued liabilities	$ 74,247	$ 76,600