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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Equity Method Investments And Joint Ventures [Abstract]        
Loss from unconsolidated affiliates     $ (1,457) $ (1,788)
Elimination of intercompany revenue     794 796
Loss from unconsolidated affiliates $ 352 $ (448) $ (663) $ (992)