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Income Taxes - Schedule of Income (Loss) Before Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 21, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax at statutory rate, amount											$ 19,121	$ 43,357	$ 43,608
State income tax, amount											4,067	3,835	4,548
Tax-exempt interest, net of disallowance amount											(360)	(381)	(237)
Bank-owned life insurance, amount											(1,547)	(2,675)	(1,716)
Equity-based compensation, amount											(547)	(10,741)	(3,659)
Unrecorded basis difference in foreign subsidiaries, amount											343	4,527	2,830
Enactment of federal tax reform, amount											(21)	5,505	0
Other, amount											(1,927)	961	519
Income tax expense			$ 5,109	$ 28	$ 6,820	$ 7,402	$ 10,806	$ 14,899	$ 12,327	$ 7,009	$ 19,359	$ 45,042	$ 45,893
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income tax at statutory rate, percentage of pretax income	21.00%	35.00%									21.00%	35.00%	35.00%
State income tax, percentage of pretax income											4.47%	3.10%	3.65%
Tax-exempt interest, net of disallowance percentage of pretax income											(0.40%)	(0.31%)	(0.19%)
Bank-owned life insurance, percentage of pretax income											(1.70%)	(2.16%)	(1.38%)
Equity-based compensation, percentage of pretax income											(0.60%)	(8.67%)	(2.94%)
Unrecorded basis difference in foreign subsidiaries, percentage of pretax income											0.38%	3.65%	2.27%
Enactment of federal tax reform, percentage of pretax income											(0.02%)	4.44%	0.00%
Other, percentage of pretax income											(2.12%)	0.78%	0.42%
Effective income tax rate, percentage of pretax income											21.26%	36.36%	36.83%
Executive Officer
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Equity-based compensation, amount											$ 230	$ 654	$ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Equity-based compensation, percentage of pretax income											0.25%	0.53%	0.00%

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