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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Interest_Rate_Swaps | Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |
Number of interest rate swaps | Interest_Rate_Swaps | 3 |
Fair value hedging instruments | $ 0 | $ 0
June 2015 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Notional value | $ 25,000,000 |
Interest rate swap, expiration date | 2015-06 |
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 | $ 25,000,000 |

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