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Interim Consolidated Financial Statements - Revised Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current Assets: |  |
Prepaid expenses and other current assets | $ 18,645 | $ 18,978
Total current assets | 221,723 | 336,697
Other assets | 11,166 | 8,809
Total assets | 368,828 | 487,650
Current Liabilities: |  |
Deferred revenue | 125,787 | 150,495
Total current liabilities | 151,889 | 181,345
Total liabilities | 160,861 | 190,778
Retained earnings | 118,814 | 117,450
Total stockholders' equity | 207,967 | 296,872
Total liabilities and stockholders' equity | 368,828 | 487,650
As Previously Reported [Member] |  |
Current Assets: |  |
Prepaid expenses and other current assets |  | 18,846
Total current assets |  | 336,565
Other assets |  | 9,123
Total assets |  | 487,832
Current Liabilities: |  |
Deferred revenue |  | 150,479
Total current liabilities |  | 181,329
Total liabilities |  | 190,762
Retained earnings |  | 117,648
Total stockholders' equity |  | 297,070
Total liabilities and stockholders' equity |  | 487,832
Adjustments [Member] |  |
Current Assets: |  |
Prepaid expenses and other current assets |  | 132
Total current assets |  | 132
Other assets |  | (314)
Total assets |  | (182)
Current Liabilities: |  |
Deferred revenue |  | 16
Total current liabilities |  | 16
Total liabilities |  | 16
Retained earnings |  | (198)
Total stockholders' equity |  | (198)
Total liabilities and stockholders' equity |  | (182)
As Revised [Member] |  |
Current Assets: |  |
Prepaid expenses and other current assets |  | 18,978
Total current assets |  | 336,697
Other assets |  | 8,809
Total assets |  | 487,650
Current Liabilities: |  |
Deferred revenue |  | 150,495
Total current liabilities |  | 181,345
Total liabilities |  | 190,778
Retained earnings |  | 117,450
Total stockholders' equity |  | 296,872
Total liabilities and stockholders' equity |  | $ 487,650

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