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Investment in Non-Consolidated Joint Venture - Components of Joint Venture Investment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]  
Beginning Balance $ 34,703us-gaap_EquityMethodInvestments
Capital contributed to the joint venture 1,372us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Ending Balance 36,895us-gaap_EquityMethodInvestments
Joint Venture [Member]  
Schedule of Equity Method Investments [Line Items]  
Beginning Balance 34,703us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Capital contributed to the joint venture 1,372us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Our share of cumulative earnings 820us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Ending Balance $ 36,895us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember