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SHARE-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs), USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Restricted Stock Units (RSUs)
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Balance beginning of period (units) 588,727
Granted (units) 178,031
Vested (units) (263,864)
Forfeited (units) (91,331)
Balance end of period (units) 411,563
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, beginning of period (in USD per share) $ 9.37
Weighted Average Grant Date Fair Value, Awards granted (in USD per share) $ 30.53
Weighted Average Grant Date Fair Value, Awards vested (in USD per share) $ 11.37
Weighted Average Grant Date Fair Value, Awards Forfeited (in USD per share) $ 6.55
Weighted Average Grant Date Fair Value, end of period (in USD per share) $ 15.29
Unamortized Compensation Expense $ 4,022 [1]
[1] Expected to be recognized over the next three years.