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Related Party Transactions - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Related Party Transactions [Abstract] | |||
| Related party transactions | $ 0us-gaap_RelatedPartyTransactionAmountsOfTransaction | $ 0us-gaap_RelatedPartyTransactionAmountsOfTransaction | $ 0us-gaap_RelatedPartyTransactionAmountsOfTransaction |
| Amount included in accounts payable and accrued liabilities | $ 0us-gaap_DueToRelatedPartiesCurrent | $ 0us-gaap_DueToRelatedPartiesCurrent | |
| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of transactions with related party during the financial reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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