The Company and Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Hoka [Member]	Sep. 30, 2012 Hoka [Member]	Dec. 31, 2012 Contingent Consideration Arrangement	Dec. 31, 2011 Contingent Consideration Arrangement	Dec. 31, 2012 Contingent Consideration Arrangement Forecast	Dec. 31, 2012 Contingent Consideration Arrangement Forecast Minimum	Dec. 31, 2012 Contingent Consideration Arrangement Forecast Maximum
Contingent consideration
Compound annual growth rate (CAGR) (as a percent)								16.40%
Gross profit range									$ 50,000	$ 79,000
Discount rate (as percent)								7.00%
Percentage point change to compound annual growth rate								5.00%
Effect of a five-percentage-point change to total liability								4,000
Total maximum payout					2,000	2,000
Reconciliation of beginning and ending amounts related to the fair value for contingent consideration for acquisition of business, categorized as Level 3
Balance at the beginning of the period						91,600
Payments						(30,000)
Contingent consideration for acquisition of business				1,100		1,100	88,100
Change in fair value						8,760	3,500
Balance at the end of the period						71,460	91,600
Research and Development Costs
Research and development costs incurred	15,617	14,160	11,833
Advertising, Marketing, and Promotion Costs
Advertising, marketing, and promotion expenses	78,528	57,259	33,104
Prepaid advertising, marketing, and promotion expenses	$ 119	$ 139
Income Taxes
Minimum percentage used for determination of recognition of effect of income tax position if position more likely than not of being sustained	50.00%
Reconciliations of basic to diluted weighted-average common shares outstanding
Weighted-average shares used in basic computation	36,879,000	38,605,000	38,615,000
Dilutive effect of stock based award (in shares)	455,000	660,000	677,000
Weighted-average shares used for diluted computation	37,334,000	39,265,000	39,292,000