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Segment Results for Reportable Segments and Corporate Activities (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Disclosure [Line Items]        
Gross premiums written $ 1,392,000,000 $ 1,340,500,000 $ 2,693,100,000 $ 2,578,100,000
Net premiums written 1,209,400,000 1,158,500,000 2,343,400,000 2,252,500,000
Net premiums earned 1,098,944,000 1,068,315,000 2,152,941,000 2,143,328,000
Net loss and LAE 629,213,000 650,512,000 1,240,372,000 1,217,925,000
Commissions, brokerage and other underwriting expenses 359,604,000 339,016,000 683,840,000 665,243,000
Underwriting profit (loss) 110,100,000 [1] 78,800,000 [1] 228,700,000 [1] 260,200,000 [1]
Net investment income 114,094,000 100,403,000 224,677,000 219,214,000
Net realized capital gains 41,524,000 26,977,000 138,360,000 77,879,000
Other than temporary impairment losses (932,000) (8,908,000) (6,152,000) (41,220,000)
Other income 37,586,000 9,432,000 68,032,000 20,573,000
Other operating expenses 66,236,000 27,222,000 119,578,000 57,960,000
Corporate administration 12,687,000 9,868,000 22,319,000 22,290,000
Amortization of intangible assets (876,000) 825,000 (2,737,000) 12,455,000
Interest expense 21,932,000 21,785,000 43,743,000 43,521,000
Earnings (losses) before income taxes 202,420,000 146,991,000 470,743,000 400,380,000
Operating Segments
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 1,397,100,000 1,346,600,000 2,705,600,000 2,589,400,000
Net premiums written 1,209,400,000 1,158,500,000 2,343,400,000 2,252,500,000
Net premiums earned 1,098,900,000 1,068,300,000 2,152,900,000 2,143,300,000
Net loss and LAE 629,200,000 650,500,000 1,240,400,000 1,217,900,000
Commissions, brokerage and other underwriting expenses 359,600,000 339,000,000 683,800,000 665,200,000
Underwriting profit (loss) 110,100,000 [1] 78,800,000 [1] 228,700,000 [1] 260,200,000 [1]
Net investment income 112,400,000 96,100,000 221,600,000 189,400,000
Net realized capital gains 41,800,000 29,500,000 116,900,000 78,800,000
Other than temporary impairment losses (900,000) (8,900,000) (6,200,000) (41,200,000)
Other income (1,500,000) 1,100,000 1,900,000 1,700,000
Other operating expenses 23,900,000 17,500,000 45,200,000 37,900,000
Corporate administration 100,000   200,000  
Amortization of intangible assets (900,000) 800,000 (3,000,000) 12,400,000
Interest expense 12,200,000 12,400,000 24,500,000 24,700,000
Earnings (losses) before income taxes 226,600,000 165,900,000 496,000,000 413,900,000
Operating Segments | Reinsurance Segment
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 947,100,000 896,300,000 1,888,400,000 1,804,000,000
Net premiums written 890,000,000 843,300,000 1,769,800,000 1,709,300,000
Net premiums earned 831,900,000 834,600,000 1,625,200,000 1,688,600,000
Net loss and LAE 482,700,000 515,100,000 946,600,000 986,400,000
Commissions, brokerage and other underwriting expenses 274,400,000 259,000,000 513,900,000 510,300,000
Underwriting profit (loss) 74,800,000 [1] 60,500,000 [1] 164,700,000 [1] 191,900,000 [1]
Operating Segments | Reinsurance Segment | Property
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 310,300,000 314,500,000 608,900,000 584,600,000
Net premiums written 271,300,000 271,000,000 521,900,000 507,700,000
Net premiums earned 258,700,000 251,800,000 493,200,000 502,000,000
Net loss and LAE 121,800,000 98,300,000 183,100,000 154,600,000
Commissions, brokerage and other underwriting expenses 80,800,000 76,000,000 146,100,000 138,400,000
Underwriting profit (loss) 56,100,000 [1] 77,500,000 [1] 164,000,000 [1] 209,000,000 [1]
Operating Segments | Reinsurance Segment | Casualty & Other
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 636,800,000 [2] 581,800,000 [2] 1,279,500,000 [2] 1,219,400,000 [2]
Net premiums written 618,700,000 [2] 572,300,000 [2] 1,247,900,000 [2] 1,201,600,000 [2]
Net premiums earned 573,200,000 [2] 582,800,000 [2] 1,132,000,000 [2] 1,186,600,000 [2]
Net loss and LAE 360,900,000 [2] 416,800,000 [2] 763,500,000 [2] 831,800,000 [2]
Commissions, brokerage and other underwriting expenses 193,600,000 [2] 183,000,000 [2] 367,800,000 [2] 371,900,000 [2]
Underwriting profit (loss) 18,700,000 [1],[2] (17,000,000) [1],[2] 700,000 [1],[2] (17,100,000) [1],[2]
Operating Segments | Insurance Segment
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 450,000,000 450,300,000 817,200,000 785,400,000
Net premiums written 319,400,000 315,200,000 573,600,000 543,200,000
Net premiums earned 267,000,000 233,700,000 527,700,000 454,700,000
Net loss and LAE 146,500,000 135,400,000 293,800,000 231,500,000
Commissions, brokerage and other underwriting expenses 85,200,000 80,000,000 169,900,000 154,900,000
Underwriting profit (loss) 35,300,000 [1] 18,300,000 [1] 64,000,000 [1] 68,300,000 [1]
Operating Segments | Insurance Segment | RSUI
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 377,400,000 395,400,000 679,700,000 681,200,000
Net premiums written 252,400,000 263,700,000 447,800,000 445,000,000
Net premiums earned 205,600,000 187,500,000 409,600,000 363,100,000
Net loss and LAE 105,000,000 110,100,000 217,500,000 180,600,000
Commissions, brokerage and other underwriting expenses 54,600,000 51,400,000 109,300,000 99,700,000
Underwriting profit (loss) 46,000,000 [1] 26,000,000 [1] 82,800,000 [1] 82,800,000 [1]
Operating Segments | Insurance Segment | CapSpecialty
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 56,900,000 45,500,000 106,000,000 85,600,000
Net premiums written 51,500,000 42,300,000 94,800,000 80,100,000
Net premiums earned 45,800,000 37,200,000 88,100,000 74,500,000
Net loss and LAE 29,700,000 17,700,000 53,600,000 35,700,000
Commissions, brokerage and other underwriting expenses 23,100,000 21,300,000 45,100,000 40,900,000
Underwriting profit (loss) (7,000,000) [1] (1,800,000) [1] (10,600,000) [1] (2,100,000) [1]
Operating Segments | Insurance Segment | PacificComp
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written 15,700,000 [3] 9,400,000 [3] 31,500,000 [3] 18,600,000 [3]
Net premiums written 15,500,000 [3] 9,200,000 [3] 31,000,000 [3] 18,100,000 [3]
Net premiums earned 15,600,000 [3] 9,000,000 [3] 30,000,000 [3] 17,100,000 [3]
Net loss and LAE 11,800,000 [3] 7,600,000 [3] 22,700,000 [3] 15,200,000 [3]
Commissions, brokerage and other underwriting expenses 7,500,000 [3] 7,300,000 [3] 15,500,000 [3] 14,300,000 [3]
Underwriting profit (loss) (3,700,000) [1],[3] (5,900,000) [1],[3] (8,200,000) [1],[3] (12,400,000) [1],[3]
Corporate activities
        
Segment Reporting Disclosure [Line Items]        
Gross premiums written (5,100,000) [4] (6,100,000) [4] (12,500,000) [4] (11,300,000) [4]
Net investment income 1,700,000 [4] 4,300,000 [4] 3,100,000 [4] 29,800,000 [4]
Net realized capital gains (300,000) [4] (2,500,000) [4] 21,500,000 [4] (900,000) [4]
Other income 39,100,000 [4] 8,300,000 [4] 66,100,000 [4] 18,800,000 [4]
Other operating expenses 42,400,000 [4] 9,700,000 [4] 74,400,000 [4] 20,100,000 [4]
Corporate administration 12,600,000 [4] 9,900,000 [4] 22,100,000 [4] 22,300,000 [4]
Amortization of intangible assets     300,000 [4]  
Interest expense 9,700,000 [4] 9,400,000 [4] 19,200,000 [4] 18,800,000 [4]
Earnings (losses) before income taxes $ (24,200,000) [4] $ (18,900,000) [4] $ (25,300,000) [4] $ (13,500,000) [4]
[1] Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, net realized capital gains, OTTI losses, other income, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its segments' operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company's ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.
[2] Primarily consists of the following assumed reinsurance lines of business: directors' and officers' liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; and credit.
[3] Includes underwriting results of AIHL Re.
[4] Includes elimination of minor reinsurance activity between segments.