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Shareholders' Equity - Additional Information (Detail) - USD ($) |  | 18 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 02, 2014 | Jun. 30, 2015 | Sep. 30, 2015 | Aug. 11, 2015 | Mar. 05, 2015 | Dec. 31, 2014 | Jul. 21, 2014 | Jun. 30, 2014
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  |  |  |  |  | $ 25,000,000
Total number of shares repurchased (in shares) |  | 5,444,389 |  |  |  |  |  |
Shares repurchased, number of shares received initially (in shares) |  |  | 5,444,000 | 3,059,629 |  | 2,385,000 |  |
Fair value of common stock repurchased |  |  | $ 175,025,000 |  |  | $ 75,025,000 |  |
Maximum |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  |  |  |  | $ 200,000,000 |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Shares repurchased, aggregate repurchase amount | $ 50,000,000 |  |  |  |  |  |  |
Total number of shares repurchased (in shares) | 1,539,760 |  |  |  |  |  |  |
Second Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Shares repurchased, aggregate repurchase amount |  |  |  |  | $ 100,000,000 |  |  |
Shares repurchased, number of shares received initially (in shares) |  |  |  | 391,637 | 2,667,992 |  |  |
Fair value of common stock repurchased |  |  |  |  | $ 85,000,000 |  |  |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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