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Summary of Significant Accounting Policies - Cash Payments Made for Interest and Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash payments for:      
Interest $ 105,449 $ 94,177 $ 62,812
Income taxes   $ 77 $ 682