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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Apr. 07, 2014
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jan. 30, 2013
Initial public offering [Member]
Jun. 30, 2014
Initial public offering [Member]
Jun. 30, 2013
Initial public offering [Member]
Jan. 30, 2013
Initial public offering [Member]
Jun. 30, 2014
Stock option [Member]
Sep. 24, 2010
Equity based incentive units [Member]
Jun. 30, 2014
Equity based incentive units [Member]
Dec. 31, 2010
Equity based incentive units [Member]
Aug. 05, 2014
Subsequent Event [Member]
Jul. 07, 2014
Subsequent Event [Member]
Jun. 30, 2014
Minimum [Member]
Stock option [Member]
Jun. 30, 2014
Minimum [Member]
Restricted stock awards [Member]
Jun. 30, 2014
Maximum [Member]
Stock option [Member]
Jun. 30, 2014
Maximum [Member]
Restricted stock awards [Member]
Jun. 30, 2014
2013 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Common stock shares issued at initial public offering   31,632,533   31,597,907       10,000,000           129,700,000          
Common stock public offering price               $ 17.00                      
Net proceeds from issuance of common stock     $ 155,408,000   $ 155,400,000                            
Underwriting discounts and commissions         11,900,000                            
Net offering expenses               2,700,000                      
Common stock, shares outstanding   31,632,533   31,597,907   31,632,533 31,597,907                        
Common stock                                     11,727,833
Shares available for future grant                                     10,942,517
Stock option awards, vesting period 3 years                           1 year 1 year 3 years 3 years  
Expiration from the date of grant                 10 years                    
Unrecognized stock based compensation related to all stock-based awards   7,700,000                                  
Weighted average period, expense to recognize   2 years                                  
Options, granted 154,598 154,598                                  
Stock option awards granted, fair value $ 9.46                                    
Restricted stock units, granted 217,839 217,839                     56,448            
Restricted stock award granted, fair value $ 16.17 $ 16.17                     $ 13.34            
Vesting terms description                   The recipients of the equity based incentive units have all the rights of a stockholder, including the rights to vote those shares and receive any dividends or distributions made with respect to those shares and any shares or other property received in respect of those shares; provided, however, any non-cash dividend or distribution with respect to the common stock shall be subject to the same vesting provisions as the incentive units. The vesting terms of the equity based incentive units are as follows: (1)18.75% of such units vested, subject to limitation in (3) below on the date following the first-year anniversary of the date of such officer’s employment; (2) 56.25% of such units vest, subject to limitation in (3) below in equal quarterly installments between the first and fourth-year anniversary of the date of such officer’s employment; (3) 25% of the awards granted in (1) and (2) will vest upon a liquidity event, as defined in each such recipient’s employment agreement; and (4) 25% of such units will be converted into a number of shares of restricted stock prior to a liquidity event.                  
Equity based incentive granted                       $ 3,300,000              
Equity based incentive units, granted                     0                
Equity based incentive units, forfeited                     0                
Percentage of equity based incentive units vested                     25.00%