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Income Taxes - Summary of Tax Credit Carryforwards (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Tax Credit Carryforward [Line Items] |
Tax Credit Carryforwards | $ 57,019 us-gaap_TaxCreditCarryforwardAmount
United States [Member] |
Tax Credit Carryforward [Line Items] |
Tax Credit Carryforwards | 35,261 us-gaap_TaxCreditCarryforwardAmount / us-gaap_StatementGeographicalAxis = country_US
Canada [Member] |
Tax Credit Carryforward [Line Items] |
Tax Credit Carryforwards | $ 21,758 us-gaap_TaxCreditCarryforwardAmount / us-gaap_StatementGeographicalAxis = country_CA

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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