Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt - Summary of Analysis of Financial Statement Line Item Impacted by Cash Flow Hedges in Condensed Consolidated Statement of Operations (Detail)

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Long-term Debt - Summary of Analysis of Financial Statement Line Item Impacted by Cash Flow Hedges in Condensed Consolidated Statement of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]        
Total interest expense $ 17,584 $ 10,635 $ 46,728 $ 32,945
Impact of hedging $ 201 $ 253 $ 798 $ 1,042