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Stockholders' Equity - Additional Information (Detail)
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3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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| Noncontrolling Interest [Line Items] | ||
| Certain Class B stockholders converted into Class A | 16,236 | 22,880 |
| X | ||||||||||
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- Definition
Stock converted from one class to other class, shares. No definition available.
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| X | ||||||||||
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- Details
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