Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Pre Tax Income [Line Items]
Pre-tax income from U.S. operations	$ 190,400	$ 168,500	$ 165,200
U.S. federal tax at statutory rate	21.00%	21.00%	35.00%
Provisional tax charge recorded due to enactment of Tax Act	$ 11,700
Re-measurement of U.S. deferred tax assets	6,700
Repatriation taxes on accumulated undistributed foreign earnings	5,000
Reduction in provisional tax charge		$ 400
Unrecognized tax benefits	6,831	4,718	$ 2,650	$ 29
Recognized penalties and interest on unrecognized tax benefits	600	400	200
Penalties and interest accrued on unrecognized tax benefits	$ 1,200	600
New York State [Member] | Earliest Tax Year [Member]
Schedule Of Pre Tax Income [Line Items]
Income tax year under examination	2010
New York State [Member] | Latest Tax Year [Member]
Schedule Of Pre Tax Income [Line Items]
Income tax year under examination	2017
Foreign Country [Member]
Schedule Of Pre Tax Income [Line Items]
Pre-tax income from foreign operations	$ 67,000	$ 49,600	$ 36,600