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Investments in Joint Ventures - Assets, Liabilities and Shareholders' Equity of Joint Venture (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment In Joint Venture [Abstract]    
Receivables from related parties $ 524us-gaap_DueFromRelatedPartiesCurrent $ 636us-gaap_DueFromRelatedPartiesCurrent
Liabilities to related parties $ 22,039us-gaap_DueToRelatedPartiesCurrent $ 19,278us-gaap_DueToRelatedPartiesCurrent