Other Assets and Other Liabilities - Schedule of Amortization Expense and Rental Revenues (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Amortization Expense 2018	$ 107,897
Amortization Expense 2019	90,168
Amortization Expense 2020	73,790
Amortization Expense 2021	56,494
Amortization Expense 2022	41,689
Amortization Expense Thereafter	98,233
Amortization Expense Totals	468,271
2018	(13,862)
2019	25,635
2020	42,140
2021	46,332
2022	41,855
Thereafter	185,340
Total	$ 327,440