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Other Comprehensive Loss - Changes in Accumulated OCI by Component (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | $ 3,246,012 | $ 3,463,469 | $ 3,797,528
Other comprehensive income (loss) before reclassifications | 2,258 | 1,403 | (104)
Change in cash flow hedges reclassed to earnings | 828 | 688 | 1,173
Total other comprehensive income | 3,377 | 2,210 | 288
Ending Balance | 2,897,438 | 3,246,012 | 3,463,469
Net current-period other comprehensive income (loss) | 3,086 | 2,091 | 1,069
Gains and Losses on Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (3,930) | (6,109) | (8,485)
Other comprehensive income (loss) before reclassifications | 1,002 | 1,491 | 1,203
Change in cash flow hedges reclassed to earnings | 828 | 688 | 1,173
Total other comprehensive income | 1,830 | 2,179 | 2,376
Ending Balance | (2,100) | (3,930) | (6,109)
Foreign Currency Items [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (262) | (174) | 1,133
Other comprehensive income (loss) before reclassifications | 1,256 | (88) | (1,307)
Change in cash flow hedges reclassed to earnings | 0 | 0 | 0
Total other comprehensive income | 1,256 | (88) | (1,307)
Ending Balance | 994 | (262) | (174)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (4,192) | (6,283) | (7,352)
Ending Balance | $ (1,106) | $ (4,192) | $ (6,283)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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