Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Summary of Presentation of Total Balance of Financial Statement Line Item Related to Our Hedging Activities in Our Consolidated Statements of Operations and Impact of Our Hedges (Detail)

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Long-term Debt - Summary of Presentation of Total Balance of Financial Statement Line Item Related to Our Hedging Activities in Our Consolidated Statements of Operations and Impact of Our Hedges (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]      
Total interest expense $ 65,472 $ 45,241 $ 26,385
Impact of hedging $ 972 $ 1,316 $ (4)