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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operations:    
Net income (loss) for the period $ 6,959 $ (508)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 5,045 5,553
Deferred income tax 14,399 (6,769)
Amortization of notes receivable 9,388 9,760
Amortization of debt issuance costs 319 319
Amortization of intangible assets   3,233
Provision for credit losses (147) 111
Share-based compensation expense 3,280 2,224
Changes in operating assets and liabilities (145,122) (37,790)
Cash used in operating activities (105,879) (23,867)
Cash flows from Investment activities    
Purchase of office facilities (11,687) (7,821)
Cash used in investing activities (11,687) (7,821)
Cash flows from financing activities    
Cash dividends paid on Class A non-voting and Class B voting common stock (2,994) (2,990)
Repurchase of Class A non-voting common stock (208) (1,551)
Tax benefit from share-based awards   41
Other financing activities 91,500 59,400
Cash provided by financing activities 88,298 54,900
Net increase (decrease) in cash and cash equivalents (29,268) 23,212
Cash and cash equivalents, beginning of period 135,366 70,329
Cash and cash equivalents, end of period 106,098 93,541
Parent [Member]
    
Cash flows from operations:    
Net income (loss) for the period (6,327) (5,868)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Deferred income tax   90
Amortization of debt issuance costs 319 319
Changes in operating assets and liabilities 9,328 8,517
Cash used in operating activities 3,320 3,058
Cash flows from financing activities    
Cash dividends paid on Class A non-voting and Class B voting common stock (2,994) (2,990)
Repurchase of Class A non-voting common stock (208) (1,551)
Tax benefit from share-based awards   41
Cash provided by financing activities (3,202) (4,500)
Net increase (decrease) in cash and cash equivalents 118 (1,442)
Cash and cash equivalents, beginning of period 35 2,555
Cash and cash equivalents, end of period 153 1,113
Guarantor Subsidiaries [Member]
    
Cash flows from operations:    
Net income (loss) for the period 3,776 2,185
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Deferred income tax   (2)
Changes in operating assets and liabilities (8,250) 11,799
Cash used in operating activities (4,474) 13,982
Cash flows from financing activities    
Net increase (decrease) in cash and cash equivalents (4,474) 13,982
Cash and cash equivalents, beginning of period 40,658 11,882
Cash and cash equivalents, end of period 36,184 25,864
Non-Guarantor Subsidiaries [Member]
    
Cash flows from operations:    
Net income (loss) for the period 9,510 3,175
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 5,045 5,553
Deferred income tax 14,399 (6,857)
Amortization of notes receivable 9,388 9,760
Amortization of intangible assets   3,233
Provision for credit losses (147) 111
Share-based compensation expense 3,280 2,224
Changes in operating assets and liabilities (146,200) (58,106)
Cash used in operating activities (104,725) (40,907)
Cash flows from Investment activities    
Purchase of office facilities (11,687) (7,821)
Cash used in investing activities (11,687) (7,821)
Cash flows from financing activities    
Other financing activities 91,500 59,400
Cash provided by financing activities 91,500 59,400
Net increase (decrease) in cash and cash equivalents (24,912) 10,672
Cash and cash equivalents, beginning of period 94,673 55,892
Cash and cash equivalents, end of period $ 69,761 $ 66,564