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Significant Accounting Policies - Effects of Prior Period Errors in Consolidated Statements of Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Net income | $ 143,162 | $ 131,951 | $ 262,035 | $ 239,882 | $ 463,962 | $ 414,959 | $ 292,883 |
| Total comprehensive income | 140,590 | 117,336 | 249,447 | 234,764 | |||
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As Previously Reported [Member]
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|||||||
| Net income | 133,368 | 241,530 | 477,190 | 412,578 | 299,215 | ||
| Total comprehensive income | $ 118,753 | $ 236,412 | |||||
| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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