Quarterly report pursuant to Section 13 or 15(d)

Investments - Additional Information (Detail)

v3.2.0.727
Investments - Additional Information (Detail)
3 Months Ended
Jun. 30, 2015
Minimum [Member]  
Investment Securities [Line Items]  
Treasury with original maturities period 3 months
Maximum [Member]  
Investment Securities [Line Items]  
Investment maturity date range end May 11, 2016
Treasury with original maturities period 1 year