Operating Results for Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended
Jul. 19, 2013
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenue       $ 3,185 $ 5,512
Income (loss) before provision for income taxes     14 (111) (947)
Income tax expense (benefit)     5 (41) (9)
Income (loss) from discontinued operations, net of tax     9 (70) (938)
Gain on sale of discontinued operations 1,500   422 1,492  
Income tax expense (benefit)     144 562  
Gain on sale of discontinued operations, net of tax   278 278 930  
Discontinued operations, net of tax     $ 287 $ 860 $ (938)