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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Interest Costs Incurred Capitalized [Abstract]        
Interest capitalized, beginning of period $ 5,564 $ 5,358 $ 5,106 $ 4,434
Interest incurred 6,580 6,397 13,139 12,785
Interest expense (5,914) (4,814) (11,750) (9,902)
Interest charged to cost of sales (278) (2,365) (543) (2,741)
Interest capitalized, end of period $ 5,952 $ 4,576 $ 5,952 $ 4,576