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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Interest_Rate_Swaps | Dec. 31, 2015 USD ($) Interest_Rate_Swaps
Schedule Of Available For Sale Securities [Line Items] |  |
Number of interest rate swaps | Interest_Rate_Swaps | 1 | 3
Fair value hedging instruments | $ 0 | $ 0
Maturity Tenure Two Years [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value |  | 10,000,000
Maturity Tenure Three Years [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value |  | 15,000,000
Maturity Tenure Five Years [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 10,000,000 | 25,000,000
June 2015 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value |  | $ 25,000,000
Interest rate swap, expiration date | 2015-06 |

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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