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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Roll Forward]        
Interest capitalized, beginning of period $ 3,854 $ 5,388 $ 4,154 $ 5,583
Interest incurred 6,596 6,517 19,702 19,737
Interest expense (6,293) (6,197) (18,809) (18,808)
Interest charged to cost of sales (581) (1,136) (1,471) (1,940)
Interest capitalized, end of period $ 3,576 $ 4,572 $ 3,576 $ 4,572