Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Abu Dhabi Commercial Bank Litigation [Member]
Loss Contingencies [Line Items]
Number of plaintiffs	11
Number of Plaintiffs Dismissed By Court	4	1
Number of Plaintiffs Granted	2
Number of plaintiffs filed motions for reconsideration	3
Number of Plaintiffs Ordered to Trial	14
Alleged Additional Compensatory Damages	$ 76.0
Legacy Tax Matters [Member]
Loss Contingencies [Line Items]
Liabilities for 2000 Distribution Agreement and Liabilities for Legacy Tax Matters, liability for the remaining potential exposure including accrued interest	$ 17.7
Class Action [Member]
Loss Contingencies [Line Items]
Number of plaintiffs	2