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Stockholders' Equity and Stock-Based Compensation - Summary of Changes in Stockholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule Of Shareholders Equity [Line Items]        
Beginning balance     $ 322,306 $ 149,153
Net income 6,124 2,075 10,422 2,345
Unrealized loss on available-for-sale-investments    (243)    (182)
Total comprehensive income 6,124 1,832 10,422 2,163
Issuance of common stock, net of issuance costs       155,408
Stock-based compensation expense 962 517 1,528 844
Minimum tax withholding paid on behalf of employees for stock awards     (303)  
Ending balance 333,953 307,568 333,953 307,568
Common Stock [Member]
        
Schedule Of Shareholders Equity [Line Items]        
Beginning balance     316 0
Net income     0  
Conversion of members' equity into common stock       216
Issuance of common stock, net of issuance costs       100
Stock-based compensation expense     0  
Minimum tax withholding paid on behalf of employees for stock awards     0  
Ending balance 316 316 316 316
Additional Paid-in Capital [Member]
        
Schedule Of Shareholders Equity [Line Items]        
Beginning balance     310,878 0
Conversion of members' equity into common stock       153,199
Issuance of common stock, net of issuance costs       155,308
Stock-based compensation expense     1,528 844
Minimum tax withholding paid on behalf of employees for stock awards     (303)  
Ending balance 312,103 309,351 312,103 309,351
Retained Earnings (Accumulated Deficit) [Member]
        
Schedule Of Shareholders Equity [Line Items]        
Beginning balance     11,112 0
Net income     10,422 2,345
Conversion of members' equity into common stock       (4,262)
Ending balance 21,534 (1,917) 21,534 (1,917)
Accumulated Other Comprehensive Income [Member]
        
Schedule Of Shareholders Equity [Line Items]        
Beginning balance       0
Unrealized loss on available-for-sale-investments       (182)
Ending balance   (182)   (182)
Total Stockholders' Equity [Member]
        
Schedule Of Shareholders Equity [Line Items]        
Beginning balance       0
Net income       2,345
Unrealized loss on available-for-sale-investments       (182)
Total comprehensive income       2,163
Conversion of members' equity into common stock       149,153
Issuance of common stock, net of issuance costs       155,408
Stock-based compensation expense       844
Ending balance   307,568   307,568
Members' Equity [Member]
        
Schedule Of Shareholders Equity [Line Items]        
Beginning balance       149,153
Conversion of members' equity into common stock       (149,153)
Ending balance   $ 0   $ 0