Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operations:
Net income (loss) for the period	$ 6,792	$ 12,467
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization of office facilities and leasehold improvements	5,787	7,434
Deferred income taxes	6,423	13,862
Amortization of notes receivable	12,393	14,086
Amortization of debt issuance costs	408	479
Write-off of debt issuance costs	588	0
Amortization of mortgage servicing rights	2,025	1,120
Provision for credit losses	28	178
Share-based compensation expense	3,682	3,966
Payment of taxes due for share-based awards	(2,074)	0
Changes in operating assets and liabilities	(22,315)	(30,644)
Cash provided by operating activities	13,737	22,948
Cash flows from investing activities
Purchase of office facilities	(3,366)	(12,642)
Cash used in investing activities	(3,366)	(12,642)
Cash flows from investing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(4,483)	(4,494)
Repurchase of Class A non-voting common stock for cancellation	0	(2,314)
Issuance of Class A non-voting common stock	185	85
Tax benefit (deficiency) from share-based awards	1,275	(92)
Redemption of senior secured notes	(45,000)	0
Other financing activities	17,300	(33,500)
Cash flow provided by (used in) financing activities	(30,723)	(40,315)
Net increase (decrease) in cash and cash equivalents	(20,352)	(30,009)
Cash and cash equivalents, beginning of period	98,294	135,366
Cash and cash equivalents, end of period	77,942	105,357
Guarantor Subsidiaries [Member]
Cash flows from operations:
Net income (loss) for the period	5,791	4,809
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Changes in operating assets and liabilities	(31,569)	(13,026)
Cash provided by operating activities	(25,778)	(8,217)
Cash flows from investing activities
Net increase (decrease) in cash and cash equivalents	(25,778)	(8,217)
Cash and cash equivalents, beginning of period	30,901	40,658
Cash and cash equivalents, end of period	5,123	32,441
Non-Guarantor Subsidiaries [Member]
Cash flows from operations:
Net income (loss) for the period	11,000	17,083
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization of office facilities and leasehold improvements	5,787	7,434
Deferred income taxes	6,423	13,862
Amortization of notes receivable	12,393	14,086
Write-off of debt issuance costs	0
Amortization of mortgage servicing rights	2,025	1,120
Provision for credit losses	28	178
Share-based compensation expense	3,391	3,966
Changes in operating assets and liabilities	(50,269)	(33,576)
Cash provided by operating activities	(9,222)	24,153
Cash flows from investing activities
Purchase of office facilities	(3,366)	(12,642)
Cash used in investing activities	(3,366)	(12,642)
Cash flows from investing activities
Other financing activities	17,300	(33,500)
Cash flow provided by (used in) financing activities	17,300	(33,500)
Net increase (decrease) in cash and cash equivalents	4,712	(21,989)
Cash and cash equivalents, beginning of period	66,945	94,673
Cash and cash equivalents, end of period	71,657	72,684
Parent Company [Member]
Cash flows from operations:
Net income (loss) for the period	(9,999)	(9,425)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Amortization of debt issuance costs	408	479
Write-off of debt issuance costs	588
Share-based compensation expense	291
Payment of taxes due for share-based awards	(2,074)
Changes in operating assets and liabilities	59,523	15,958
Cash provided by operating activities	48,737	7,012
Cash flows from investing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(4,483)	(4,494)
Repurchase of Class A non-voting common stock for cancellation		(2,314)
Issuance of Class A non-voting common stock	185	85
Tax benefit (deficiency) from share-based awards	1,275	(92)
Redemption of senior secured notes	(45,000)
Cash flow provided by (used in) financing activities	(48,023)	(6,815)
Net increase (decrease) in cash and cash equivalents	714	197
Cash and cash equivalents, beginning of period	448	35
Cash and cash equivalents, end of period	$ 1,162	$ 232