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Discontinued Operations and Divestitures - Summarized Financial Information For Discontinued Operations, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]                      
Revenue                   $ 6,248 $ 14,589
Loss from operations of discontinued operations before income tax expense                 $ (917) (3,518) (925)
Income tax benefit                 (375) (1,195) (171)
Loss from operations of discontinued operations, net of tax $ (121) $ (133) $ (258) $ (30) $ (1,097) $ (561) $ (330) $ (335) $ (542) (2,323) (754)
Gain on disposal of discontinued operations, before income tax expense                   1,510 133
Income tax expense                   83 34
Gain on disposal of discontinued operations, net of tax         $ (35) $ 1,172 $ 290     $ 1,427 $ 99