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Summary of Significant Accounting Policies (Income Taxes) - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Examination [Line Items] |  |  |  |
Total amount of unrecognized tax benefits relating to uncertain tax positions | $ 35,240,000 | $ 54,541,000 | $ 50,668,000 | $ 48,306,000
Amount of unrecognized tax benefits change from year end relating to uncertain tax positions | (19,300,000) |  |  |
Unrecognized tax benefits decrease resulting from current period tax positions | 23,400,000 |  |  |
Unrecognized tax benefits increase resulting from settlements with taxing authorities | 4,200,000 |  |  |
Maximum [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $ 12,332,000 | $ 27,485,000 | $ 10,221,000 |
Tax Year 2010 [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination, year completed | 2010 |  |  |
Tax Year 2011 [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination, year completed | 2011 |  |  |
Tax Year 2012 [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination, year completed | 2012 |  |  |

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