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Supplemental Disclosure to Consolidated Statement of Cash Flow - Supplemental Disclosure to Consolidated Statement of Cash Flows (Phantoms) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]      
Interest capitalized $ 82,034 $ 77,193 $ 53,028