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Capitalized Interest - Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Roll Forward]    
Interest capitalized, beginning of period $ 4,154 $ 5,583
Interest incurred 6,499 6,595
Interest expense (6,215) (6,282)
Interest charged to cost of sales (298) (351)
Interest capitalized, end of period $ 4,140 $ 5,545