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Schedule of Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Change In Accounting Principle |  |  |  |
Total assets | $ 2,429,345 | $ 2,188,639 |  |
Total liabilities | 650,990 | 683,579 |  |
Common stock | 23,488 | 22,948 |  |
Additional paid-in capital | 1,347,762 | 1,293,130 |  |
Accumulated other comprehensive (loss) income | 5,820 | 4,746 |  |
Retained earnings | 401,285 | 184,236 |  |
Total shareholders' equity | 1,778,355 | 1,505,060 | 1,122,188 | 664,579
Total liabilities and shareholders' equity | 2,429,345 | 2,188,639 |  |
Originally Reported |  |  |  |
Change In Accounting Principle |  |  |  |
Total assets |  | 2,188,639 |  |
Total liabilities |  | 683,579 |  |
Common stock |  | 22,948 |  |
Additional paid-in capital |  | 1,293,130 |  |
Accumulated other comprehensive (loss) income |  | (129,875) |  |
Retained earnings |  | 318,857 |  |
Total shareholders' equity |  | 1,505,060 |  |
Total liabilities and shareholders' equity |  | 2,188,639 |  |
Effect Of Accounting Change |  |  |  |
Change In Accounting Principle |  |  |  |
Accumulated other comprehensive (loss) income |  | 134,621 |  |
Retained earnings |  | $ (134,621) |  |

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