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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating activities      
Net cash (used in) provided by operating activities $ 128,903,000 $ 81,048,000 $ 43,709,000
Investing activities      
Purchases of property and equipment (1,140,000) (1,196,000) (1,128,000)
Net cash provided by investing activities (96,960,000) (9,330,000) (42,943,000)
Financing activities      
Proceeds from stock option exercise 2,344,000 781,000 3,339,000
Tax benefit from share-based payments 2,024,000 421,000 1,043,000
Redemption of Subordinated Debt Security   (25,780,000) (10,310,000)
Purchase of treasury stock     (10,268,000)
Dividends to shareholders (5,910,000)    
Net cash used in financing activities (1,542,000) (24,578,000) (16,196,000)
Change in cash and cash equivalents 30,401,000 47,140,000 (15,430,000)
Cash and cash equivalents at beginning of year 92,676,000 45,536,000 60,966,000
Cash and cash equivalents at end of year 123,077,000 92,676,000 45,536,000
Parent Company [Member]
      
Operating activities      
Net cash (used in) provided by operating activities 1,829,000 5,149,000 (3,646,000)
Investing activities      
Purchases of investments (10,248,000) (23,361,000) (57,148,000)
Proceeds from sales of investments 11,674,000 39,537,000 40,990,000
Purchases of property and equipment (779,000) (842,000) (943,000)
Dividends from subsidiary 15,000,000 21,000,000 32,000,000
Net cash provided by investing activities 15,647,000 36,334,000 14,899,000
Financing activities      
Proceeds from stock option exercise 2,344,000 781,000 3,339,000
Tax benefit from share-based payments 2,024,000 421,000 1,043,000
Redemption of Subordinated Debt Security   (25,780,000) (10,310,000)
Purchase of treasury stock     (10,268,000)
Dividends to shareholders (5,910,000)    
Net cash used in financing activities (1,542,000) (24,578,000) (16,196,000)
Change in cash and cash equivalents 15,934,000 16,905,000 (4,943,000)
Cash and cash equivalents at beginning of year 31,792,000 14,887,000 19,830,000
Cash and cash equivalents at end of year $ 47,726,000 $ 31,792,000 $ 14,887,000