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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Dec. 31, 2016 $ in Thousands | USD ($) € / $ NOK / $ | NOK € / $ NOK / $ | EUR (€) € / $ NOK / $
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Fair Value / Carrying Amount of Asset (Liability) | $ (2,993) |  |
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year | 75,556 |  |
Expected Maturity Amount of Foreign Currency Derivatives in Year Two | $ 12,719 |  |
Euro [Member] |  |  |
Derivative [Line Items] |  |  |
Average Forward Rate | € / $ | 0.92 | 0.92 | 0.92
Fair Value / Carrying Amount of Asset (Liability) | $ (304) |  |
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year | 14,879 |  |
Expected Maturity Amount of Foreign Currency Derivatives in Year Two | $ 0 |  |
Euro [Member] | Foreign currency forward contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Contract Amount in Foreign Currency | € |  |  | € 13,750,000
Norwegian Kroner [Member] |  |  |
Derivative [Line Items] |  |  |
Average Forward Rate | NOK / $ | 8.31 | 8.31 | 8.31
Fair Value / Carrying Amount of Asset (Liability) | $ (2,689) |  |
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year | 60,677 |  |
Expected Maturity Amount of Foreign Currency Derivatives in Year Two | $ 12,719 |  |
Norwegian Kroner [Member] | Foreign currency forward contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Contract Amount in Foreign Currency | NOK |  | NOK 610,000,000 |

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- Definition Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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