Other Assets - Summary of Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Prepaid expenses	$ 16,108	$ 12,708
Derivative assets	18,437	6,676
Rent and other deposits	1,279	1,479
Other	675	131
Total other current assets	$ 36,499	$ 20,994