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Summary of Significant Accounting Policies - Interest Cost Capitalized and Incurred (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Interest incurred									$ 2,292	$ 2,656	$ 2,538
Interest capitalized									756	487	1,210
Interest expense	$ 575	$ 558	$ 57	$ 346	$ 527	$ 567	$ 495	$ 580	$ 1,536	$ 2,169	$ 1,328

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of the cost of borrowed funds accounted for as interest expense.

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