Quarterly report pursuant to Section 13 or 15(d)

Pension Plans - Additional Information (Detail)

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Pension Plans - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]          
Employment benefits $ 203,111        
Number of years in providing benefits 5 years        
Pension plan expenses   $ 51,000 $ 51,000 $ 102,000 $ 68,000