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Share-Based Compensation - Summary of Incentive Unit Activity and Changes (Details) - Incentive Unit Award
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Units  
Non-vested at the beginning of the period (in shares) | shares 604,942
Granted (in shares) | shares 17,761
Vested (in shares) | shares (2,451)
Forfeited (in shares) | shares (31,129)
Non-vested at the end of the period (in shares) | shares 589,123
Weighted-Average Grant-Date Fair Value  
Non-vested at the beginning of the period (in dollars per share) | $ / shares $ 19.64
Granted (in dollars per share) | $ / shares 11.41
Vested (in dollars per share) | $ / shares 19.73
Forfeited (in dollars per share) | $ / shares 19.42
Non-vested at the end of the period (in dollars per share) | $ / shares $ 19.41