Deferred compensation (Cash Incentive Plan) (Detail) - The 2015 Cash LTIP - USD ($)
$ in Thousands |
|
3 Months Ended |
12 Months Ended |
|
Mar. 31, 2017 |
Mar. 31, 2017 |
Mar. 21, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Apr. 03, 2017 |
| Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] |
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| Deferred Compensation Arrangement with Individual, Requisite Service Period |
|
4 years
|
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| 2015 Cash LTIP expense (net of amounts capitalized) |
$ 13
|
|
|
|
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|
|
| Subsequent Event |
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| Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] |
|
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|
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| Additional amount awarded |
|
|
|
|
|
|
$ 3,321
|
| Predecessor |
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| Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] |
|
|
|
|
|
|
|
| Deferred Compensation Arrangement with Individual, Requisite Service Period |
|
|
|
|
4 years
|
|
|
| 2015 Cash LTIP expense (net of amounts capitalized) |
|
|
$ 5
|
$ 159
|
$ 1,008
|
$ 610
|
|
| 2015 Cash LTIP payments |
|
|
$ 17
|
$ 42
|
$ 666
|
|
|
| Additional amount awarded |
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|
|
|
|
$ 3,297
|
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