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Reorganization - Schedule of Rolls Forward of Activity in Reorganization Accrual (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost And Reserve [Line Items] |  |
Accrual Beginning Balance | $ 481 |
Additions | 1,026 | $ 4,433
Cash payments | (1,507) |
Accrual Ending Balance |  | 481
Workforce Reduction [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Accrual Beginning Balance | 41 |
Additions | 1,022 |
Cash payments | (1,063) |
Accrual Ending Balance |  | 41
Subsidiary Liquidation [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Accrual Beginning Balance | 7 |
Cash payments | (7) |
Accrual Ending Balance |  | 7
Products Group Reorganization [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Accrual Beginning Balance | 433 |
Additions | 4 |
Cash payments | $ (437) |
Accrual Ending Balance |  | $ 433

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