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Discontinued Operations and Divestitures - Gain on Disposals of Discontinued Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]        
Gain on disposal of discontinued operations, before income tax $ 1,381 $ 1,010 $ 1,510 $ 125
Income tax expense 209 403 48 19
Gain on disposal of discontinued operations, net of tax $ 1,172 $ 607 $ 1,462 $ 106