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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operations:    
Net income (loss) for the period $ 12,467 $ 2,516
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 7,434 8,019
Deferred income tax 13,862 (8,317)
Amortization of notes receivable 14,086 14,679
Amortization of debt issuance costs 479 479
Amortization of intangible assets   3,244
Provision for credit losses 178 (308)
Share-based compensation expense 3,966 3,030
Changes in operating assets and liabilities (29,524) (48,805)
Cash provided by (used in) operating activities 22,948 (25,463)
Cash flows from Investment activities    
Purchase of office facilities (12,642) (12,390)
Cash used in investing activities (12,642) (12,390)
Cash flows from financing activities    
Cash dividends paid on Class A non-voting and Class B voting common stock (4,494) (4,489)
Issuance of Class A non-voting common stock 85  
Repurchase of Class A non-voting common stock (2,314) (1,766)
Tax deficiency from share-based awards (92) (137)
Other financing activities (33,500) 67,100
Cash (used in) provided by financing activities (40,315) 60,708
Net increase (decrease) in cash and cash equivalents (30,009) 22,855
Cash and cash equivalents, beginning of period 135,366 70,329
Cash and cash equivalents, end of period 105,357 93,184
Parent [Member]
    
Cash flows from operations:    
Net income (loss) for the period (9,425) (9,026)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Amortization of debt issuance costs 479 479
Changes in operating assets and liabilities 15,958 12,991
Cash provided by (used in) operating activities 7,012 4,444
Cash flows from financing activities    
Cash dividends paid on Class A non-voting and Class B voting common stock (4,494) (4,489)
Issuance of Class A non-voting common stock 85  
Repurchase of Class A non-voting common stock (2,314) (1,766)
Tax deficiency from share-based awards (92) (137)
Cash (used in) provided by financing activities (6,815) (6,392)
Net increase (decrease) in cash and cash equivalents 197 (1,948)
Cash and cash equivalents, beginning of period 35 2,555
Cash and cash equivalents, end of period 232 607
Guarantor Subsidiaries [Member]
    
Cash flows from operations:    
Net income (loss) for the period 4,809 4,439
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Changes in operating assets and liabilities (13,026) 6,119
Cash provided by (used in) operating activities (8,217) 10,558
Cash flows from financing activities    
Net increase (decrease) in cash and cash equivalents (8,217) 10,558
Cash and cash equivalents, beginning of period 40,658 11,882
Cash and cash equivalents, end of period 32,441 22,440
Non-Guarantor Subsidiaries [Member]
    
Cash flows from operations:    
Net income (loss) for the period 17,083 7,103
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 7,434 8,019
Deferred income tax 13,862 (8,317)
Amortization of notes receivable 14,086 14,679
Amortization of intangible assets   3,244
Provision for credit losses 178 (308)
Share-based compensation expense 3,966 3,030
Changes in operating assets and liabilities (32,456) (67,915)
Cash provided by (used in) operating activities 24,153 (40,465)
Cash flows from Investment activities    
Purchase of office facilities (12,642) (12,390)
Cash used in investing activities (12,642) (12,390)
Cash flows from financing activities    
Other financing activities (33,500) 67,100
Cash (used in) provided by financing activities (33,500) 67,100
Net increase (decrease) in cash and cash equivalents (21,989) 14,245
Cash and cash equivalents, beginning of period 94,673 55,892
Cash and cash equivalents, end of period $ 72,684 $ 70,137