Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operations:
Net income (loss) for the period	$ 2,167	$ 6,959
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization of office facilities and leasehold improvements	3,862	5,045
Deferred income taxes	7,299	14,399
Amortization of notes receivable	8,534	9,388
Amortization of debt issuance costs	287	319
Write-off of debt issuance costs	588	0
Amortization of mortgage servicing rights	1,514	538
Provision for (reversal of) credit losses	13	(147)
Share-based compensation expense	3,479	3,280
Payment of taxes due for share-based awards	(2,074)	0
Changes in operating assets and liabilities	(39,059)	(145,660)
Cash used in operating activities	(13,390)	(105,879)
Cash flows from investing activities
Purchase of office facilities	(2,185)	(11,687)
Cash used in investing activities	(2,185)	(11,687)
Cash flows from investing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(2,984)	(2,994)
Repurchase of Class A non-voting common stock for cancellation	0	(208)
Issuance of Class A non-voting common stock	185	0
Tax benefit from share-based awards	1,254	0
Redemption of senior secured notes	(45,000)	0
Other financing activities	29,000	91,500
Cash flow provided by (used in) financing activities	(17,545)	88,298
Net increase (decrease) in cash and cash equivalents	(33,120)	(29,268)
Cash and cash equivalents, beginning of period	98,294	135,366
Cash and cash equivalents, end of period	65,174	106,098
Guarantor Subsidiaries [Member]
Cash flows from operations:
Net income (loss) for the period	4,638	3,776
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Write-off of debt issuance costs	0
Changes in operating assets and liabilities	(28,979)	(8,250)
Cash used in operating activities	(24,341)	(4,474)
Cash flows from investing activities
Net increase (decrease) in cash and cash equivalents	(24,341)	(4,474)
Cash and cash equivalents, beginning of period	30,901	40,658
Cash and cash equivalents, end of period	6,560	36,184
Non-Guarantor Subsidiaries [Member]
Cash flows from operations:
Net income (loss) for the period	5,584	9,510
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization of office facilities and leasehold improvements	3,862	5,045
Deferred income taxes	7,299	14,399
Amortization of notes receivable	8,534	9,388
Write-off of debt issuance costs	0
Amortization of mortgage servicing rights	1,514	538
Provision for (reversal of) credit losses	13	(147)
Share-based compensation expense	3,247	3,280
Changes in operating assets and liabilities	(66,397)	(146,738)
Cash used in operating activities	(36,344)	(104,725)
Cash flows from investing activities
Purchase of office facilities	(2,185)	(11,687)
Cash used in investing activities	(2,185)	(11,687)
Cash flows from investing activities
Other financing activities	29,000	91,500
Cash flow provided by (used in) financing activities	29,000	91,500
Net increase (decrease) in cash and cash equivalents	(9,529)	(24,912)
Cash and cash equivalents, beginning of period	66,945	94,673
Cash and cash equivalents, end of period	57,416	69,761
Parent Company [Member]
Cash flows from operations:
Net income (loss) for the period	(8,055)	(6,327)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Amortization of debt issuance costs	287	319
Write-off of debt issuance costs	588
Share-based compensation expense	232
Payment of taxes due for share-based awards	(2,074)
Changes in operating assets and liabilities	56,317	9,328
Cash used in operating activities	47,295	3,320
Cash flows from investing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(2,984)	(2,994)
Repurchase of Class A non-voting common stock for cancellation		(208)
Issuance of Class A non-voting common stock	185
Tax benefit from share-based awards	1,254
Redemption of senior secured notes	(45,000)
Cash flow provided by (used in) financing activities	(46,545)	(3,202)
Net increase (decrease) in cash and cash equivalents	750	118
Cash and cash equivalents, beginning of period	448	35
Cash and cash equivalents, end of period	$ 1,198	$ 153