Fair Values of Financial Instruments and Interest Rate Risk - Additional Information (Detail) |
6 Months Ended |
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Jun. 30, 2016
USD ($)
| |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] | |
Short term borrowings due period | 1 year |
Current fair value of off-balance sheet financial instruments | $ 0 |