Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014	May. 23, 2013 USD ($)
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
CalPERS [Member]
Loss Contingencies [Line Items]
Total compensatory damages value	$ 1,300,000
Unrealized losses claimed by the Plaintiff	779,000
Pursuit Partners LLC [Member]
Loss Contingencies [Line Items]
Payment regarding Calpers Litigation matter	125,000
Pursuit Partners LLC [Member] | Damages sought for all plaintiffs [Member]
Loss Contingencies [Line Items]
Total compensatory damages value	$ 44,000
PSERS [Member]
Loss Contingencies [Line Items]
Payment regarding Calpers Litigation matter			$ 5,750
Commerzbank AG [Member]
Loss Contingencies [Line Items]
Payment regarding Calpers Litigation matter			$ 69,600