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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

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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