Income Taxes - Summary of Income Tax Provision Reconciled to Income Taxes that Computed at Statutory Federal Rate (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jul. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income tax, at statutory rates		$ 19,728	$ 16,861	$ 28,017
Increase (deduction) in taxes resulting from:
Tax-exempt income		(952)	(1,096)	(1,652)
Excise tax on real estate investment trust (REIT) dividend		0	0	1,945
Adjustment to net deferred tax asset for Tax Cuts and Jobs Act		0	0	(1,343)
State income tax, net of federal income tax effect		4,322	1,880	931
Adjustment to net deferred tax asset for change in NJ tax law	$ (943)	0	(943)	0
Excess tax benefits from employee share-based payments		(189)	(318)	(587)
Other, net		363	504	158
Total provision for income taxes		$ 23,272	$ 16,888	$ 27,469