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Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Incentive_Plan
Dec. 31, 2012
Dec. 31, 2011
Dec. 20, 2013
Equity Incentive Plan [Member]
Dec. 31, 2013
Equity Incentive Plan [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock Three [Member]
Dec. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2013
Options [Member]
Dec. 31, 2012
Options [Member]
Dec. 31, 2011
Options [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
Restricted Stock [Member]
Dec. 31, 2013
Maximum [Member]
Options [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares authorized 225,000,000 225,000,000     8,553,608                 225,000,000     75,000,000  
Annual increase in number of shares of common stock         4.00%                          
Aggregate limit of shares issuable to incentive stock option awards         3,000,000                          
Equity incentive plans 3                                  
Initial grant of stock-based compensation in shares       6,000,000                            
Increase in percentage of outstanding number of shares of common stock       4.00%                            
Term of years 5 years 1 month 6 days 6 years 4 months 24 days 7 years 4 months 24 days               4 years       10 years 10 years    
Vesting period of grant date           1 year   3 years             3 years 3 years   1 year
Restricted stock units vest and convert into shares of our common stock             4 years                      
Percentage of vested grant yearly                     25.00%              
Percentage of vested grant monthly                     75.00%              
Unexercised vested option forfeiture                     3 months              
Total unrecognized compensation expense $ 4,275,000                                  
Vesting period 3 years                                  
Estimated fair value per share of options granted $ 0.00 $ 0.00 $ 5.31                              
Intrinsic value of options at time of exercise 2,214 4,319 11,293                              
Estimated fair value                     406,000 627,000 1,545,000          
Exercise price $ 20.42             $ 20.00                    
Reduced compensation expense               11,000   344,000                
Total compensation expense $ 2,608,670 $ 2,878,134 $ 3,260,937           $ 18,000