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Segment Information - Company's Reportable Segments (Parenthetical) (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
Segment Reporting [Abstract]        
Impairment charges $ 34,439 $ 42,101 $ 37,525 $ 42,132