Income Taxes - Reconciliation of Effective Tax Rate on Income or Loss and Statutory Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory U.S. tax rate	35.00%	35.00%	35.00%
State income taxes, net of U.S. tax benefit	1.90%	0.90%	(0.80%)
Federal and State tax credits, net of U.S. tax benefit	(9.80%)	22.60%	(0.10%)
Expenses with no tax benefit	1.10%	(0.30%)	(0.10%)
Foreign income taxed at other than U.S. statutory rate	1.30%	(4.20%)	(0.60%)
Effect of foreign rate changes	(13.40%)	(5.10%)	2.50%
Foreign tax credit	(13.50%)	9.40%	(1.20%)
Basis differences of intangibles with an indefinite life	0.10%	(4.10%)	1.30%
Change in deferred tax valuation allowance	35.30%	(76.80%)	(37.70%)
Reversal of previously accrued taxes	0.00%		0.10%
Accrual for interest and income taxes related to uncertain tax positions	(7.30%)	(0.10%)	0.80%
Effective Income Tax Rate Reconciliation, Income (Loss) From Flowthrough Entities, Percent	(1.90%)	1.30%	(0.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	3.30%	(7.20%)	(0.80%)
Effective Income Tax Rate Reconciliation, Group Loss Relief, Percent	(2.60%)	4.90%	0.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	2.30%	(6.90%)	(0.10%)
Effective Income Tax Rate Reconciliation, Foreign Dividends and Earnings Inclusion, Percent	(0.90%)	(6.80%)	0.00%
Effective Income Tax Rate Reconciliation, Foreign Tax Withholding, Percent	2.40%	(1.50%)	(0.20%)
Other	(7.30%)	(3.10%)	(2.50%)
Effective tax rate	26.00%	(42.00%)	(4.20%)