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Shareholders' Equity - Additional Information (Detail) - USD ($) | Mar. 31, 2016 | Jan. 06, 2016 | Dec. 31, 2015 | Nov. 11, 2015 | Aug. 11, 2015 | Jul. 20, 2015 | Mar. 05, 2015
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Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Shares repurchased, authorized amount | $ 250,000,000 |  |  |  | $ 50,000,000 | $ 400,000,000 |
Shares repurchased, number of shares received initially (in shares) | 7,794,000 |  | 7,430,000 |  | 3,059,629 |  |
Fair value of common stock repurchased | $ 250,025,000 |  | $ 238,775,000 |  |  |  |
Third Accelerated Share Repurchase Program [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Shares repurchased, authorized amount |  | $ 375,000,000 |  |  |  |  |
Shares repurchased, aggregate repurchase amount |  |  |  | $ (75,000,000) |  |  |
Shares repurchased, number of shares received initially (in shares) |  | 363,209 |  | 1,985,981 |  |  |
Fair value of common stock repurchased |  |  |  | $ 63,750,000 |  |  |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Shares repurchased, number of shares received initially (in shares) | 7,793,579 |  |  |  |  |  |
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
Repurchase Agreements [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Shares repurchased, authorized amount | $ 100,000,000 |  |  |  |  |  |

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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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