Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payment for Operating Leases

At December 31, 2017, minimum rental commitments under non-cancelable operating leases, net of sublease income, are approximately as follows:

Year Ending December 31,
2018	$	83,851
2019		73,889
2020		69,845
2021		67,118
2022		56,268
Thereafter		442,438
Total minimum lease payments		793,409
Less sublease proceeds		36,141
Net lease payments	$	757,268