Prepaid Expenses - Prepaid Expenses, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Prepaid Expense, Current [Abstract]
Prepaid maintenance	$ 7,509	$ 5,315
Prepaid insurance	4,207	3,112
Prepaid rent	1,919	3,147
Prepaid other	3,686	3,322
Total prepaid expenses	$ 17,321	$ 14,896