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Significant Accounting Policies - Effects of Prior Period Errors in Consolidated Statement of Cash Flows (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 |
| Deferred income taxes | (7,939) | (8,476) | |||||
| Income taxes | (12,546) | 20,661 | |||||
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As Previously Reported [Member]
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|||||||
| Net income | 133,368 | 241,530 | 477,190 | 412,578 | 299,215 | ||
| Deferred income taxes | (4,896) | ||||||
| Income taxes | $ 15,433 | ||||||
| X | ||||||||||
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- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. 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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