Fair Value Measurements - Additional Information (Detail) - Jun. 30, 2015 - USD ($) |
Total |
Total |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Transfer of assets from level 1 to 2 | $ 0 | $ 0 |
| Transfer of assets from level 2 to 1 | 0 | 0 |
| Transfer of liabilities from level 1 to 2 | 0 | 0 |
| Transfer of liabilities from level 2 to 1 | 0 | 0 |
| Transfer of assets into level 3 | 0 | |
| Transfer of assets out of level 3 | 0 | |
| Transfer of liabilities into level 3 | 0 | |
| Transfer of liabilities out of level 3 | 0 | |
| Other Income (Expense) [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Recognized other-than-temporary impairment loss | $ 0 | $ 10,000 |