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Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail) | 8 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Stockholders' Equity [Abstract] |  |  |  |
Shares outstanding at beginning of year |  | 43,130,000 us-gaap_SharesOutstanding | 42,784,000 us-gaap_SharesOutstanding | 42,650,000 us-gaap_SharesOutstanding
Shares repurchased | (755,310)us-gaap_StockRepurchasedDuringPeriodShares | (464,190)us-gaap_StockRepurchasedDuringPeriodShares |  | (374,000)us-gaap_StockRepurchasedDuringPeriodShares
Treasury shares issued for: |  |  |  |
Restricted stock awards |  | 162,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 86,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 76,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
401(k) plan |  | 116,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan | 123,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan | 152,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Employee stock options exercised |  | 110,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 137,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 280,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Shares outstanding at end of year | 43,054,000 us-gaap_SharesOutstanding | 43,054,000 us-gaap_SharesOutstanding | 43,130,000 us-gaap_SharesOutstanding | 42,784,000 us-gaap_SharesOutstanding

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- Definition Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. + References No definition available. + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + 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 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 Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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