Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) |
1 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2015 |
Feb. 28, 2014 |
Sep. 30, 2016 |
Dec. 31, 2015 |
|
| Derivative [Line Items] | ||||
| Notional amount | $ 4,944,000 | $ 5,151,000 | ||
| Interest Rate Swaps Agreement | ||||
| Derivative [Line Items] | ||||
| Interest rate swap agreement, term | 14 years | 15 years | ||
| Notional amount | $ 1,200,000 | $ 4,370,000 | ||