Litigation and Regulatory Matters - Additional Information (Details) - USD ($)	1 Months Ended
	May. 31, 2015	Jun. 30, 2015
Loss Contingencies [Line Items]
Estimate of loss		$ 100,000,000
Hau Yin To v. HSBC Bank plc, et al. [Member]
Loss Contingencies [Line Items]
Damages sought (not less than)	$ 8,000,000