Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Schedule of Equity Method Investments [Line Items]
Minimum Percentage of investment consolidated	50.00%
Maximum percentage of cost method investments	20.00%
Cash and cash equivalents at end of year	$ 351,817,000	$ 233,710,000	$ 413,359,000		$ 426,981,000
Maximum maturity period of notes	6 months
Finite lived intangible asset useful life, Minimum	5 years
Finite lived intangible asset useful life, Maximum	30 years
Common stock not included in the computation of diluted share	13,100	1,045,709	8,000
Maximum hedging period	12 months
Products liability expenses, Minimum	0
Products liability expenses, Maximum	33,000,000
Advertising expense	49,756,000	34,401,000	30,156,000
Research and Development Expense	50,801,000	44,586,000	39,748,000
Settled tax and interest obligation			31,400,000
Pursuant to the settlement agreement, CSA paid to the company approximately		17,639,000
Liabilities relating to the disposition through discontinued operation				7,400,000
Noncontrolling Shareholders' Interests in Consolidated Subsidiaries
Schedule of Equity Method Investments [Line Items]
Notes payable to the noncontrolling shareholder	14,319,000	14,283,000
Cash Equivalents [Member]
Schedule of Equity Method Investments [Line Items]
Original maturity of highly liquid investments	3 months
Related Party Transaction [Member]
Schedule of Equity Method Investments [Line Items]
Interest paid	900,000	859,000	941,000
Paid to the noncontrolling shareholder for the purchase of utilities	$ 46,235,000	$ 41,595,000	$ 41,032,000
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments ownership percentage	20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments ownership percentage	50.00%