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Summary of Significant Accounting Policies (Income Taxes) - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2016 USD ($)
Income Tax Examination [Line Items] |
Total amount of unrecognized tax benefits relating to uncertain tax positions | $ 59,500,000
Amount of unrecognized tax benefits change from year end relating to uncertain tax positions | 5,000,000
Maximum [Member] |
Income Tax Examination [Line Items] |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $ 32,100,000
Tax Year 2010 [Member] |
Income Tax Examination [Line Items] |
Income tax examination, year completed | 2010
Tax Year 2011 [Member] |
Income Tax Examination [Line Items] |
Income tax examination, year completed | 2011
Tax Year 2012 [Member] |
Income Tax Examination [Line Items] |
Income tax examination, year completed | 2012

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