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Reconciliation of Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Effective Tax Rates [Line Items]
Income tax expense at federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax effect	1.70%	(4.30%)	2.00%
Foreign earnings taxed at different rates	(14.00%)	2.90%	(18.30%)
Withholding tax	1.10%	14.30%	9.70%
Foreign tax credit	(0.30%)	(9.60%)	(5.40%)
Other international components	0.80%	0.80%	3.40%
Change in valuation allowance	(0.10%)	21.10%	(0.80%)
Deferred tax adjustments and rate changes	(0.10%)	(4.90%)	(2.80%)
Meals and entertainment	0.30%	5.90%	4.50%
Other tax credits	0.10%	2.50%	2.50%
Subpart F income	0.50%	4.00%	2.40%
Research and development tax credit	(0.60%)	(13.70%)	(12.60%)
Other permanent differences	(1.20%)	(1.60%)	0.80%
Release of unrecognized tax benefits	0.00%	0.00%	(86.00%)
Total	23.20%	54.40%	(58.50%)
Non-deductible Officers Compensation
Schedule Of Effective Tax Rates [Line Items]
Other tax credits	0.00%	2.00%	7.10%

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