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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2016 | Jun. 07, 2016 | Apr. 26, 2016 | Mar. 17, 2016 | Feb. 09, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Nov. 30, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) |  |  | $ 0.07 |  | $ 0.07 | $ 0.07 | $ 0.06 | $ 0.14 | $ 0.12 |
Payments of common stock dividends |  | $ 4,300,000 |  | $ 4,300,000 |  |  | $ 3,700,000 | $ 8,600,000 | $ 7,500,000 |
Value of shares repurchased |  |  |  |  |  |  |  | $ 33,100,000 | 5,000,000 |
April 2014 Repurchase Program |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized amount of common stock (shares) |  |  |  |  |  |  | $ 15,000,000 |  | $ 15,000,000 |
Shares repurchased (shares) |  |  |  |  |  | 1,288,751 | 96,725 | 2,580,725 | 330,362 |
Value of shares repurchased |  |  |  |  |  | $ 16,800,000 | $ 1,400,000 | $ 33,100,000 | $ 5,000,000 |
November 2014 Repurchase Program |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized amount of common stock (shares) |  |  |  |  |  |  |  |  |  | $ 75,000,000
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) | $ 0.07 |  |  |  |  |  |  |  |  |

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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 Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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