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Asset Impairments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) Vessel | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) Vessel | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2017 USD ($) Vessel | Mar. 31, 2016 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment | $ 64,857 | $ 253,422 | $ 129,562 | $ 36,886 | $ 55,540 | $ 15,141 | $ 31,672 | $ 14,958 | $ 484,727 | $ 117,311 | $ 14,525
Number of vessels impaired during the period | Vessel |  |  |  |  |  |  |  |  | 132 | 58 | 12
Fair value of assets incurring impairment |  |  |  |  |  |  |  |  | $ 933,068 | $ 422,655 | $ 28,509
Net book value of assets | $ 2,864,762 |  |  |  | $ 3,551,291 |  |  |  | $ 2,864,762 | $ 3,551,291 |
Number of vessels operating | Vessel | 244 |  |  |  | 253 |  |  |  | 244 | 253 |
Total carrying value of vessels | $ 3,407,760 |  |  |  | $ 4,666,749 |  |  |  | $ 3,407,760 | $ 4,666,749 |
Stacked Vessels and Other Assets |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment |  |  |  |  |  |  |  |  | $ 265,200 |  |
Number of vessels impaired during the period | Vessel |  |  |  |  |  |  |  |  | 75 |  |
Fair value of assets incurring impairment |  |  |  |  |  |  |  |  | $ 545,900 |  |
Number of vessels stacked | Vessel | 27 |  |  |  |  |  |  |  | 27 |  |
Net book value of assets | $ 246,000 |  |  |  |  |  |  |  | $ 246,000 |  |
Active Vessels |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment |  |  |  |  |  |  |  |  | $ 178,500 |  |
Number of vessels impaired during the period | Vessel |  |  |  |  |  |  |  |  | 57 |  |
Fair value of assets incurring impairment |  |  |  |  |  |  |  |  | $ 362,100 |  |
Net book value of assets | $ 1,600,000 |  |  |  |  |  |  |  | $ 1,600,000 |  |
Number of vessels active | Vessel | 86 |  |  |  |  |  |  |  | 86 |  |
Stacked and Active Vessels |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of vessels operating | Vessel | 244 |  |  |  |  |  |  |  | 244 |  |
Total carrying value of vessels | $ 2,800,000 |  |  |  |  |  |  |  | $ 2,800,000 |  |

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