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Accelerated Share Repurchase Program- Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 16, 2016 | Jul. 16, 2016 | Jul. 16, 2016
Class Of Stock [Line Items] |  |  |
Agreement to repurchase an aggregate of common stock |  |  | $ 126,298
Purchase of shares under accelerated share repurchase | 5,600,000 |  | 6,892,194
Total ASR Cost |  |  |
Class Of Stock [Line Items] |  |  |
Agreement to repurchase an aggregate of common stock | $ 120,000 |  |
Purchase of shares under accelerated share repurchase |  | 900,000 |
Original ASR Amount Settled |  |  |
Class Of Stock [Line Items] |  |  |
Agreement to repurchase an aggregate of common stock | $ 120,000 |  |
Authorized share repurchase plan |  |  |
Class Of Stock [Line Items] |  |  |
Agreement to repurchase an aggregate of common stock |  |  | $ 630,400
Purchase of shares under accelerated share repurchase |  |  | 67,800,000

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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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: 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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