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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Roll Forward]        
Interest capitalized, beginning of period $ 5,388 $ 5,952 $ 5,583 $ 5,106
Interest incurred 6,517 6,615 19,737 19,754
Interest expense (6,197) (6,120) (18,808) (17,870)
Interest charged to cost of sales (1,136) (778) (1,940) (1,321)
Interest capitalized, end of period $ 4,572 $ 5,669 $ 4,572 $ 5,669