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Discontinued Operations - Summary of Financial Information Regarding Results of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Condensed Income Statements, Captions [Line Items]        
Income from discontinued operations, net of tax $ 0 $ 0 $ 0 $ 2,803
NE Segment        
Condensed Income Statements, Captions [Line Items]        
Revenues       53,064
Income before income tax expense       3,358
Income tax expense       555
Income from discontinued operations, net of tax       $ 2,803