Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Loss Contingencies [Line Items]
Legacy Tax Liabilities	$ 6,400,000	$ 0	$ 6,400,000	$ 0
Interest Income Expense Legacy Tax	700,000	0	700,000	0
Abu Dhabi Commercial Bank Litigation [Member]
Loss Contingencies [Line Items]
Number of plaintiffs			11
Number of Plaintiffs Dismissed By Court		1	4
Number of Plaintiffs Granted	2		2
Number of plaintiffs filed motions for reconsideration	3		3
Number of Plaintiffs Ordered to Trial	14		14
Alleged Additional Compensatory Damages	76,000,000		76,000,000
Legacy Tax Matters [Member] | litigation
Loss Contingencies [Line Items]
Liabilities for 2000 Distribution Agreement and Liabilities for Legacy Tax Matters, liability for the remaining potential exposure including accrued interest	10,800,000		10,800,000
CalPERS [Member] | litigation
Loss Contingencies [Line Items]
Unrealized Losses Claimed by the Plaintiff	779,000,000		779,000,000
Compensatory damages arising from alleged losses	$ 1,300,000,000		$ 1,300,000,000