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Income Taxes - Summary of Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal, Current |  |  |  |  |  |  |  |  | $ 167,745 us-gaap_CurrentFederalTaxExpenseBenefit | $ 134,938 us-gaap_CurrentFederalTaxExpenseBenefit | $ 111,940 us-gaap_CurrentFederalTaxExpenseBenefit
Federal, Deferred |  |  |  |  |  |  |  |  | 2,262 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 14,784 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 19,814 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal income tax provision (benefit), Total |  |  |  |  |  |  |  |  | 170,007 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 149,722 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 131,754 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State, Current |  |  |  |  |  |  |  |  | 21,109 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 17,037 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 13,980 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State, Deferred |  |  |  |  |  |  |  |  | 297 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,136 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,530 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State income tax provision (benefit), Total |  |  |  |  |  |  |  |  | 21,406 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 18,173 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 15,510 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Income tax provision (benefit), Total | $ 50,594 us-gaap_IncomeTaxExpenseBenefit | $ 51,174 us-gaap_IncomeTaxExpenseBenefit | $ 48,944 us-gaap_IncomeTaxExpenseBenefit | $ 40,701 us-gaap_IncomeTaxExpenseBenefit | $ 44,423 us-gaap_IncomeTaxExpenseBenefit | $ 45,198 us-gaap_IncomeTaxExpenseBenefit | $ 42,876 us-gaap_IncomeTaxExpenseBenefit | $ 35,398 us-gaap_IncomeTaxExpenseBenefit | $ 191,413 us-gaap_IncomeTaxExpenseBenefit | $ 167,895 us-gaap_IncomeTaxExpenseBenefit | $ 147,264 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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