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Income Taxes - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |  |
Amount of unrecognized tax benefits | $ 3,016,000 us-gaap_UnrecognizedTaxBenefits | $ 3,016,000 us-gaap_UnrecognizedTaxBenefits | $ 889,000 us-gaap_UnrecognizedTaxBenefits
Amount accrued for payment of interest |  | $ 196,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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