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v2.4.1.9

Reconciliation of Differences from U.S. Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expenses [Line Items] |  |  |  |
Pretax book income |  | $ 98,462 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 77,623 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 48,663 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal tax expense at 35% statutory rate |  | 34,462 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 27,168 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 17,032 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income taxes |  | 4,808 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 3,870 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,619 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign tax rate differential |  | (206)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (41)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (14)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Benefit of domestic production deduction |  | (2,010)us-gaap_IncomeTaxReconciliationDeductions | 0 us-gaap_IncomeTaxReconciliationDeductions | 0 us-gaap_IncomeTaxReconciliationDeductions
Reversal of income tax valuation allowance against net deferred tax assets | (59,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 0 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 0 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | (59,887)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Utilization of valuation allowance for net operating losses and credit carrryforwards - U.S. and states |  | (132)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (19,528)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other |  | 610 us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | 97 us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | 2,810 us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Total income tax expense (benefit) |  | $ 37,532 us-gaap_IncomeTaxExpenseBenefit | $ 31,094 us-gaap_IncomeTaxExpenseBenefit | $ (56,968)us-gaap_IncomeTaxExpenseBenefit

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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