Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]
Statutory Federal income tax rate	34.00%	34.00%	34.00%
Increase (Decrease) resulting from:
U.S. Taxes on foreign income, net of taxes paid credit	4.50%
NOL's recognized upon change in tax law	(2.90%)
Domestic and foreign state and local tax, net of federal benefit	3.70%	7.20%	2.70%
Nondeductible expenses	1.60%	2.80%	0.70%
Nondeductible acquisition transaction expenses		5.00%
Withholding taxes		1.70%
Nondeductible stock option compensation		0.50%	2.50%
Research and development credits	(5.30%)	(6.90%)	(3.60%)
Effect of different tax rates of foreign jurisdictions	(10.50%)	(3.20%)
Nontaxable derivative gains		(5.20%)
Other tax exempt income	(0.50%)	(8.50%)
Reverse valuation allowance on Federal NOLs			(13.50%)
Other	1.00%	2.00%
Effective rate	25.60%	29.40%	22.80%