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Investments in Unconsolidated Affiliates - Summary of Activity in Income from Unconsolidated Affiliates (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity Method Investments And Joint Ventures [Abstract]        
Loss from unconsolidated affiliates     $ (1,192) $ (1,457)
Elimination of intercompany revenue     982 794
Loss from unconsolidated affiliates $ (126) $ 352 $ (210) $ (663)