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Equity Transactions (Detail) - USD ($) | 3 Months Ended | 12 Months Ended | 63 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Oct. 21, 2015
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common shares (in shares) |  |  |  |  |  |  |  | 638,703 | 225,441 |  | 1,214,144 |
Weighted average price (in $ per share) |  |  |  |  |  |  |  | $ 125.22 | $ 178.54 |  | $ 129.85 |
Cost of shares repurchased |  |  |  |  |  |  |  | $ 80,000,000 | $ 40,300,000 |  | $ 157,700,000 |
Shares authorized for repurchase (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,500,000
Remaining shares authorized for repurchase (in shares) | 1,485,856 |  |  |  |  |  |  | 1,485,856 |  |  | 1,485,856 |
Cash dividends declared (in $ per share) | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 1.8 | $ 1.35 | $ 0 |  |
Cash dividends declared |  |  |  |  |  |  |  | $ 16,009,000 | $ 12,451,000 | $ 0 |  |
Dividends payable | $ 4,233,000 |  |  |  | $ 4,270,000 |  |  | $ 4,233,000 | $ 4,270,000 | $ 0 | $ 4,233,000 |
Dividend, to be paid date |  |  |  |  |  |  |  | Feb. 12, 2016 |  |  |  |
Dividend, record date |  |  |  |  |  |  |  | Jan. 29, 2016 |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 + Details
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