Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2014
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
Number of plaintiffs filed motions for reconsideration		3
Number of Plaintiffs Ordered to Trial		14
Alleged Additional Compensatory Damages		$ 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		$ 17,800,000
Class Action [Member]
Loss Contingencies [Line Items]
Number of plaintiffs		2