Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Income Taxes) - Additional Information (Detail)

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Summary of Significant Accounting Policies (Income Taxes) - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2017
USD ($)
Income Taxes [Line Items]  
Total amount of unrecognized tax benefits relating to uncertain tax positions $ 36,400,000
Amount of unrecognized tax benefits change from year end relating to uncertain tax positions 1,200,000
Maximum [Member]  
Income Taxes [Line Items]  
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months $ 13,400,000
Tax Year 2010 [Member] | Internal Revenue Service (IRS) [Member]  
Income Taxes [Line Items]  
Income tax examination, year completed 2010
Tax Year 2011 [Member] | Internal Revenue Service (IRS) [Member]  
Income Taxes [Line Items]  
Income tax examination, year completed 2011
Tax Year 2012 [Member] | Internal Revenue Service (IRS) [Member]  
Income Taxes [Line Items]  
Income tax examination, year completed 2012