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Stock-based Compensation - Additional Information 1 (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) Unit $ / shares $ / EquityUnit shares | Dec. 31, 2015 USD ($) Unit $ / shares $ / EquityUnit shares | Dec. 31, 2014 USD ($) Unit $ / shares $ / EquityUnit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Performance multiplier, minimum | 0.00% |  |
Performance multiplier, maximum | 200.00% |  |
Number of Options Outstanding | shares | 0 | 11,730 |
Restricted Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense recognized | $ 3.4 | $ 6.0 | $ 7.3
Grant date fair value of share units, per share | $ / shares | $ 5.46 | $ 26.70 | $ 101.20
Unrecognized compensation cost related to unvested restricted stock | $ 2.8 |  |
Period in which compensation cost expected to be recognized | 1 year 4 months 24 days |  |
Fair value of restricted stock vested | $ 1.3 | $ 3.7 | $ 10.0
Potential Performance Shares (PSU) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense recognized | $ 1.3 | $ 2.1 | $ 3.4
Performance Periods | The performance periods consist of one year, two years and three years, respectively |  |
Number of units granted | Unit | 60,015 | 94,250 | 37,792
Grant date fair value of performance share units, granted | $ 0.4 | $ 0.7 | $ 3.7
Grant date fair value of share units, per unit | $ / EquityUnit | 7.00 | 7.30 | 99.05
Minimum final number of shares of common stock issuable based on performance multiplier | shares | 0 |  |
Maximum final number of shares of common stock issuable based on performance multiplier | shares | 269,300 |  |
Performance multiplier, minimum | 0.00% |  |
Performance multiplier, maximum | 200.00% |  |
Unrecognized expense, performance share units | $ 1.1 |  |
Term for Amortization of Performance Share Compensation cost | through December 31, 2017. |  |
Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of Options Outstanding | shares | 0 |  |
Minimum | Restricted Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Amortized vesting period of restricted stock | 1 year |  |
Minimum | Potential Performance Shares (PSU) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Amortized vesting period of restricted stock | 1 year |  |
Maximum | Restricted Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Amortized vesting period of restricted stock | 3 years |  |
Maximum | Potential Performance Shares (PSU) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Amortized vesting period of restricted stock | 3 years |  |

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