Equity-Based Compensation - Summary of Equity Grants (Detail) - $ / shares
|
12 Months Ended |
|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
| Performance Units |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Beginning Balance, Units |
96,971
|
238,371
|
257,757
|
|
| Vested, Units |
(90,585)
|
(140,549)
|
|
|
| Forfeited, Units |
|
(851)
|
(19,386)
|
|
| Ending Balance, Units |
6,386
|
96,971
|
238,371
|
|
| Fair Value per unit |
$ 3.75
|
$ 3.75
|
$ 3.75
|
$ 3.27
|
| Vested, Range of Fair Value per unit |
$ (3.75)
|
$ (3.75)
|
|
|
| Forfeited, Range of Fair Value per unit |
|
|
$ (3.75)
|
|
| Deferred Compensation Share Based Payments |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Beginning Balance, Units |
52,188
|
175,298
|
329,757
|
|
| Vested, Units |
(47,277)
|
(123,110)
|
(150,398)
|
|
| Forfeited, Units |
|
|
(4,066)
|
|
| Ending Balance, Units |
4,911
|
52,188
|
175,298
|
|
| Deferred Compensation Share Based Payments | Minimum |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Fair Value per unit |
$ 12.00
|
$ 12.00
|
$ 12.00
|
|
| Vested, Range of Fair Value per unit |
(12.00)
|
(12.00)
|
|
|
| Deferred Compensation Share Based Payments | Maximum |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Fair Value per unit |
11.89
|
15.65
|
17.05
|
$ 10.47
|
| Vested, Range of Fair Value per unit |
$ (13.97)
|
$ (16.81)
|
(17.05)
|
|
| Forfeited, Range of Fair Value per unit |
|
|
$ (17.05)
|
|