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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Roll Forward]        
Interest capitalized, beginning of period $ 4,140 $ 5,545 $ 4,154 $ 5,583
Interest incurred 6,607 6,624 13,106 13,220
Interest expense (6,301) (6,329) (12,516) (12,611)
Interest charged to cost of sales (592) (452) (890) (804)
Interest capitalized, end of period $ 3,854 $ 5,388 $ 3,854 $ 5,388