Real Estate - Operating Properties and Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 31, 2019	Dec. 31, 2018
Real Estate [Abstract]
2019	$ 32,091		$ 38,769
2020	42,062		38,267
2021	38,032		34,307
2022	36,057		32,312
2023	31,029		30,180
Thereafter	681,381		670,147
Total undiscounted rental payments	860,652		843,982
Less imputed interest	468,311		0
Lease liabilities	$ 392,341	$ 400,300	$ 0