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 |
| X | ||||||||||
- Definition Original maturity period for held to maturity securities. No definition available.
|
| X | ||||||||||
- Definition Investment Securities [Line Items] No definition available.
|
| X | ||||||||||
- Definition The maturity date of the investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|