Fair value measurements (Nonrecurring Fair Value Measurements) (Detail)
$ in Thousands |
3 Months Ended |
12 Months Ended |
|
|
Mar. 31, 2017 |
Mar. 31, 2016 |
Jun. 30, 2015
USD ($)
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Jan. 31, 2017
Rig
|
Oct. 31, 2016
Rig
|
| Predecessor |
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| Fair Value of Other Financial Instruments |
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| Loss on impairment of other assets | $ |
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$ 1,393
|
$ 16,207
|
$ 0
|
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| Number of drilling rigs to be sold | Rig |
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4
|
| Significant Unobservable Inputs (Level 3) | Nonrecurring Fair Value Measurements |
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| Fair Value of Other Financial Instruments |
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| Annual inflation rate |
2.30%
|
2.42%
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| Credit-adjusted risk-free interest rate |
|
20.00%
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| Significant Unobservable Inputs (Level 3) | Nonrecurring Fair Value Measurements | Minimum |
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| Fair Value of Other Financial Instruments |
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| Credit-adjusted risk-free interest rate |
5.20%
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| Significant Unobservable Inputs (Level 3) | Nonrecurring Fair Value Measurements | Maximum |
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| Fair Value of Other Financial Instruments |
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| Credit-adjusted risk-free interest rate |
7.40%
|
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| Significant Unobservable Inputs (Level 3) | Predecessor | Nonrecurring Fair Value Measurements |
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| Fair Value of Other Financial Instruments |
|
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| Annual inflation rate |
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2.42%
|
2.91%
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| Credit-adjusted risk-free interest rate |
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|
17.05%
|
15.09%
|
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| Loss on impairment of other assets | $ |
|
|
$ 6,015
|
$ 0
|
|
$ 0
|
|
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| Number of drilling rigs to be sold | Rig |
|
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4
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