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Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 465,080	$ 424,173
Investment income	243	418
Amortization	21,620	21,610
Depreciation	6,098	5,318
Interest expense	9,682	9,897
Income before income taxes	110,967	102,549
Total assets	5,197,444	4,992,960	$ 5,262,734
Capital expenditures	3,032	4,252
Operating Segments | 0
Segment Reporting Information [Line Items]
Total revenues	239,287	232,188
Investment income	2	21
Amortization	10,647	10,989
Depreciation	1,389	1,637
Interest expense	8,576	10,403
Income before income taxes	48,855	50,452
Total assets	3,861,118	3,531,100
Capital expenditures	1,136	1,049
Operating Segments | National Programs
Segment Reporting Information [Line Items]
Total revenues	101,183	101,070
Investment income	74	248
Amortization	6,904	7,108
Depreciation	1,959	1,929
Interest expense	10,035	12,590
Income before income taxes	12,527	13,803
Total assets	2,634,008	2,499,870
Capital expenditures	1,080	1,932
Operating Segments | Wholesale Brokerage
Segment Reporting Information [Line Items]
Total revenues	65,247	53,414
Investment income	0	3
Amortization	2,931	2,442
Depreciation	490	496
Interest expense	1,675	247
Income before income taxes	15,265	14,562
Total assets	1,121,109	888,745
Capital expenditures	378	592
Operating Segments | Services
Segment Reporting Information [Line Items]
Total revenues	39,326	36,568
Investment income	80	64
Amortization	1,138	1,065
Depreciation	399	487
Interest expense	961	1,236
Income before income taxes	6,121	5,052
Total assets	363,173	324,269
Capital expenditures	150	205
Other
Segment Reporting Information [Line Items]
Total revenues	20,037	933
Investment income	87	82
Amortization	0	6
Depreciation	1,861	769
Interest expense	(11,565)	(14,579)
Income before income taxes	28,199	18,680
Total assets	(2,781,964)	(2,251,024)
Capital expenditures	$ 288	$ 474

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