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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of restricted unit vest and convert into common stock over next fiscal year 11,765
Number of restricted unit would vest over vesting period 55,000
Restricted stock units vested description after specified period 25
Restricted stock unit vest description 55,000 of these restricted stock units vest and convert into shares of our common stock after one year from the date of grant. 2,355,200 of these restricted stock units vest and convert into shares of our common stock over a four year period from the date of grant one-fourth of the award will vest on each grant date anniversary following the grant.
Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period of grant date 1 year
Number of restricted unit would vest over vesting period 2,355,200
Restricted Stock Two [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units vest and convert into shares of our common stock 4 years