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Segment Information - Company's Reportable Segments (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting [Abstract]      
Impairment charges $ 44,989 $ 58,783 $ 63,161