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Financial Instruments - Summary of Outstanding Interest Rate Swaps (Parenthetical) (Detail) - Interest Rate Swap [Member] - USD ($) | 6 Months Ended |
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Jun. 30, 2016 | Dec. 31, 2015
Derivatives, Fair Value [Line Items] |  |
Interest rate swap, description of interest received | Interest that varies with the one-month LIBOR |
Derivative, Type of Interest Rate Paid on Swap | Fixed |
Maturity Tenure Two Years [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value |  | $ 10,000,000
Interest rate swap, fixed interest rate |  | 0.885%
Maturity Tenure Three Years [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value |  | $ 15,000,000
Interest rate swap, fixed interest rate |  | 1.155%
Maturity Tenure Five Years [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional value | $ 10,000,000 | $ 25,000,000
Interest rate swap, fixed interest rate | 1.12% | 1.30%
Derivative, Type of Interest Rate Paid on Swap | Fixed |

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- Definition When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap. + 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 A -Footnote 1 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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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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