Schedule of Principal Payments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
2016 (remainder)	$ 2,500
2017	10,000
2018	10,000
2019	15,000
2020	829,000
Thereafter	600,000
Total debt	$ 1,466,500	$ 1,464,000