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Net Loss per Common Share - Additional Information (Detail)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Income Loss Per Common Share [Line Items]      
Companies common stock share outstanding 9,000,000us-gaap_OwnshareLendingArrangementSharesOutstanding 9,000,000us-gaap_OwnshareLendingArrangementSharesOutstanding 9,000,000us-gaap_OwnshareLendingArrangementSharesOutstanding
Shares loaned under the share lending arrangement 9,000,000us-gaap_OwnshareLendingArrangementSharesIssued 9,000,000us-gaap_OwnshareLendingArrangementSharesIssued 9,000,000us-gaap_OwnshareLendingArrangementSharesIssued