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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Feb. 28, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |
Notional amount |  |  | $ 4,835,000 | $ 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 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |