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Notes Payable - Schedule of Interest Activity for Notes Payable (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Interest incurred $ 6,026,000us-gaap_InterestCostsIncurred $ 1,378,000us-gaap_InterestCostsIncurred $ 824,000us-gaap_InterestCostsIncurred
Less: Amounts capitalized (6,026,000)us-gaap_InterestCostsCapitalizedAdjustment (1,327,000)us-gaap_InterestCostsCapitalizedAdjustment (823,000)us-gaap_InterestCostsCapitalizedAdjustment
Interest expense 0us-gaap_InterestExpense 51,000us-gaap_InterestExpense 1,000us-gaap_InterestExpense
Cash paid for interest $ 4,109,000us-gaap_InterestPaid $ 1,220,000us-gaap_InterestPaid $ 790,000us-gaap_InterestPaid