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Capitalized Interest - Summary of Interest Incurred, Capitalized and Expensed (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Interest Expense [Abstract]        
Interest cost incurred $ 5,079 $ 4,334 $ 14,556 $ 12,962
Interest capitalized 532 439 1,525 998
Interest expense $ 4,547 $ 3,895 $ 13,031 $ 11,964