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Other Comprehensive Loss - Changes in Accumulated OCI by Component (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 2,897,438 $ 3,246,012 $ 3,463,469
Other comprehensive income (loss) before reclassifications (744) 2,258 1,403
Change in cash flow hedges reclassed to earnings 469 828 688
Net current-period other comprehensive income (loss) (275) 3,086 2,091
Ending Balance 2,073,002 2,897,438 3,246,012
Gains and Losses on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (2,100) (3,930) (6,109)
Other comprehensive income (loss) before reclassifications (10) 1,002 1,491
Change in cash flow hedges reclassed to earnings 469 828 688
Net current-period other comprehensive income (loss) 459 1,830 2,179
Ending Balance (1,641) (2,100) (3,930)
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 994 (262) (174)
Other comprehensive income (loss) before reclassifications (734) 1,256 (88)
Change in cash flow hedges reclassed to earnings 0 0 0
Net current-period other comprehensive income (loss) (734) 1,256 (88)
Ending Balance 260 994 (262)
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (1,106) (4,192) (6,283)
Ending Balance $ (1,381) $ (1,106) $ (4,192)