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Stockholders' Equity - Additional Information (Detail)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Class B Common Stock [Member]
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| Class of Stock [Line Items] | ||||
| Certain Class B stockholders converted into Class A | 0 | 88,160 | 299,776 | 104,396 |
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Class A Common Stock [Member]
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| Class of Stock [Line Items] | ||||
| Shares issued as a part of conversion | 0 | 88,160 | 299,776 | 104,396 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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