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Equity Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 64 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016
Equity [Abstract] |  |  |
Repurchases of common shares (in shares) | 176,204 | 103,818 | 1,400,000
Weighted average purchase price per share (in $ per share) | $ 85.09 | $ 134.81 | $ 124.17
Total cost of treasury shares acquired | $ 15,000 | $ 14,000 | $ 172,600
Common stock available to repurchase (in shares) | 1,300,000.0 |  | 1,300,000.0
Cash dividends declared per share (in $ per share) | $ 0.45 | $ 0.45 |
Total cash dividends | $ 3,850 | $ 4,095 |
Dividend, to be paid date | May 13, 2016 |  |
Dividend, record date | Apr. 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 The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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