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Summary of Significant Accounting Policies - Interest Cost Capitalized and Incurred (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest incurred |  |  |  |  |  |  |  |  | $ 2,656 | $ 2,538 | $ 1,962
Interest capitalized |  |  |  |  |  |  |  |  | 487 | 1,210 | 714
Interest expense | $ 527 | $ 567 | $ 495 | $ 580 | $ 497 | $ 344 | $ 158 | $ 329 | $ 2,169 | $ 1,328 | $ 1,248

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