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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities      
Net cash (used in)/provided by operating activities $ 92,859 $ 140,684 $ 129,159
Investing activities      
Purchases of property and equipment (953) (989) (1,140)
Net cash (used in)/provided by investing activities (49,820) (141,252) (97,216)
Financing activities      
Proceeds from stock option exercises 1,844 2,674 2,344
Tax benefit from share-based payments 2,203 2,841 2,024
Dividends to shareholders (68,561) (37,068) (5,910)
Net cash used in financing activities (64,514) (31,553) (1,542)
Change in cash and cash equivalents (21,475) (32,121) 30,401
Cash and cash equivalents at beginning of year 90,956 123,077 92,676
Cash and cash equivalents at end of year 69,481 90,956 123,077
Parent Company [Member]      
Operating activities      
Net cash (used in)/provided by operating activities (1,727) 2,161 1,829
Investing activities      
Purchases of investments   (1,462) (10,248)
Proceeds from sales of investments 250 2,404 11,674
Purchases of property and equipment (627) (691) (779)
Dividends from subsidiary 50,000 25,000 15,000
Net cash (used in)/provided by investing activities 49,623 25,251 15,647
Financing activities      
Proceeds from stock option exercises 1,844 2,674 2,344
Tax benefit from share-based payments 2,204 2,841 2,024
Dividends to shareholders (68,561) (37,068) (5,910)
Net cash used in financing activities (64,513) (31,553) (1,542)
Change in cash and cash equivalents (16,617) (4,141) 15,934
Cash and cash equivalents at beginning of year 43,585 47,726 31,792
Cash and cash equivalents at end of year $ 26,968 $ 43,585 $ 47,726