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Discontinued Operations, Assets Held for Sale - Carrying Amounts of Assets and LIabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total current liabilities of discontinued operations $ 8,685 $ 6,059 $ 5,925
Commercial Business Segment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Accounts receivable 189 813 392
Total current assets of discontinued operations 189 813 392
Accounts payable 122 3,115 1,491
Accrued expenses and other current liabilities 8,248 2,944 4,434
Total current liabilities of discontinued operations $ 8,370 $ 6,059 $ 5,925