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Derivative Instruments and Hedging Activities - Effect of Gains (Losses) on Cross Currency Swaps (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gains |  |  | $ (31,098) | $ (108,271)
Total realized and unrealized gains (losses) on derivative instruments | $ (2,168) | $ (6,128) | 17,981 | (43,173)
Cross Currency Interest Rate Contract Maturity And Partial Termination |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (42,271) | 0 | (42,271) | (25,733)
Cross Currency Interest Rate Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (1,744) | (4,234) | (4,926) | (16,369)
Unrealized gains | 43,966 | 41,653 | 49,734 | 91,749
Total realized and unrealized gains (losses) on derivative instruments | $ (49) | $ 37,419 | $ 2,537 | $ 49,647

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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