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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

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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