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Summary of Significant Accounting Policies (Income Taxes) - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2016 USD ($)
Income Tax Contingency [Line Items] |
Total amount of unrecognized tax benefits relating to uncertain tax positions | $ 57,900,000
Amount of unrecognized tax benefits change from year end relating to uncertain tax positions | 3,400,000
Unrecognized tax benefits, increase resulting from current period tax positions | 1,900,000
Unrecognized tax benefits, increase due to tax positions taken in prior period | 1,900,000
Maximum [Member] |
Income Tax Contingency [Line Items] |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $ 25,900,000
Tax Year 2010 [Member] |
Income Tax Contingency [Line Items] |
Income Tax Examination, Year under Examination | 2010
Tax Year 2011 [Member] |
Income Tax Contingency [Line Items] |
Income Tax Examination, Year under Examination | 2011
Tax Year 2012 [Member] |
Income Tax Contingency [Line Items] |
Income Tax Examination, Year under Examination | 2012

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + 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 (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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