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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 | Dec. 31, 2014
Restructuring Cost And Reserve [Line Items] |  |  |
Accrual Beginning Balance | $ 481 | $ 118 |
Additions | 1,026 | 4,433 | $ 1,817
Cash payments | (1,507) | (3,595) |
Non-cash charge |  | (475) |
Accrual Ending Balance |  | 481 | 118
Workforce Reduction [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Accrual Beginning Balance | 41 | 118 |
Additions | 1,022 | 3,173 |
Cash payments | (1,063) | (3,250) |
Accrual Ending Balance |  | 41 | $ 118
Subsidiary Liquidation [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Accrual Beginning Balance | 7 |  |
Additions |  | 334 |
Cash payments | (7) | (9) |
Non-cash charge |  | (318) |
Accrual Ending Balance |  | 7 |
Products Group Reorganization [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Accrual Beginning Balance | 433 |  |
Additions | 4 | 926 |
Cash payments | $ (437) | (336) |
Non-cash charge |  | (157) |
Accrual Ending Balance |  | $ 433 |

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