Deferred compensation (Phantom Stock Plan and Restricted Stock Unit Plan) (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Jan. 01, 2017 |
| Predecessor | Phantom Shares |
|
|
|
|
| Shares |
|
|
|
|
| Granted (in shares) |
0
|
|
|
|
| Predecessor | Restricted Stock Units (RSU) |
|
|
|
|
| Shares |
|
|
|
|
| Granted (in shares) |
0
|
|
|
|
| Phantom Stock Plan | Predecessor | Phantom Shares |
|
|
|
|
| Stock-Based Compensation [Line Items] |
|
|
|
|
| Maximum percentage of fair market value of the company available for share-based awards |
2.00%
|
|
|
|
| Maximum individual award as a percentage of shares available for award |
5.00%
|
|
|
|
| Award vesting period (in years) |
5 years
|
|
|
|
| Days from vesting date to cash settlement |
120 days
|
|
|
|
| Shares |
|
|
|
|
| Granted (in shares) |
0
|
0
|
0
|
|
| Unvested and outstanding at beginning of period (in shares) |
10,619
|
23,179
|
53,162
|
|
| Vested (in shares) |
(9,729)
|
(6,456)
|
(22,041)
|
|
| Forfeited (in shares) |
(890)
|
(6,104)
|
(7,942)
|
|
| Unvested and outstanding at end of period (in shares) |
0
|
10,619
|
23,179
|
|
| Weighted average grant date fair value |
|
|
|
|
| Unvested and outstanding at beginning of period ($ per share) |
$ 18.62
|
$ 20.18
|
$ 17.01
|
|
| Granted ($ per share) |
0.00
|
0.00
|
0.00
|
|
| Vested ($ per share) |
18.39
|
24.48
|
12.61
|
|
| Forfeited ($ per share) |
$ 21.09
|
18.33
|
19.95
|
|
| Unvested and outstanding at end of period ($ per share) |
|
$ 18.62
|
$ 20.18
|
|
| Vest date fair value |
|
|
|
|
| Vest date fair value |
|
$ 25
|
$ 212
|
|
| Restricted Stock Unit Plan | Restricted Stock Units (RSU) |
|
|
|
|
| Vest date fair value |
|
|
|
|
| Estimated fair value per share at end of period ($ per share) |
|
|
|
$ 0.00
|
| Restricted Stock Unit Plan | Predecessor | Restricted Stock Units (RSU) |
|
|
|
|
| Stock-Based Compensation [Line Items] |
|
|
|
|
| Maximum percentage of fair market value of the company available for share-based awards |
2.00%
|
|
|
|
| Days from vesting date to cash settlement |
120 days
|
|
|
|
| Shares |
|
|
|
|
| Granted (in shares) |
0
|
59,571
|
504,752
|
|
| Unvested and outstanding at beginning of period (in shares) |
269,886
|
569,160
|
325,297
|
|
| Vested (in shares) |
(140,818)
|
(216,941)
|
(118,400)
|
|
| Forfeited (in shares) |
(30,472)
|
(141,904)
|
(142,489)
|
|
| Unvested and outstanding at end of period (in shares) |
98,596
|
269,886
|
569,160
|
|
| Weighted average grant date fair value |
|
|
|
|
| Unvested and outstanding at beginning of period ($ per share) |
$ 10.53
|
$ 9.91
|
$ 13.53
|
|
| Granted ($ per share) |
0.00
|
14.88
|
8.52
|
|
| Vested ($ per share) |
9.01
|
10.73
|
13.96
|
|
| Forfeited ($ per share) |
8.23
|
9.56
|
9.85
|
|
| Unvested and outstanding at end of period ($ per share) |
$ 7.18
|
$ 10.53
|
$ 9.91
|
|
| Vest date fair value |
|
|
|
|
| Vest date fair value |
|
$ 855
|
$ 1,094
|
|
| Restricted Stock Unit Plan | Predecessor | Restricted Stock Units (RSU) | Maximum |
|
|
|
|
| Stock-Based Compensation [Line Items] |
|
|
|
|
| Award vesting period (in years) |
3 years
|
|
|
|
| Phantom Stock Plan and Restricted Stock Unit Plan | Predecessor | Phantom Stock and RSU |
|
|
|
|
| Vest date fair value |
|
|
|
|
| Estimated fair value per share at end of period ($ per share) |
$ 0.00
|
|
|
|