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Segment Information - Company's Reportable Segments (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting [Abstract]        
Impairment charges $ 0 $ 14,342 $ 279,021 $ 16,671