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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 30, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest incurred |  |  |  |  |  |  |  |  | $ 1,962 | $ 2,180 | $ 2,626
Interest capitalized |  |  |  |  |  |  |  |  | 714 | 379 | 382
Interest expense | $ 414 | $ 313 | $ 146 | $ 375 | $ 346 | $ 576 | $ 356 | $ 523 | $ 1,248 | $ 1,801 | $ 2,244

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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