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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 50 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Feb. 25, 2015 | Jan. 31, 2015 | Nov. 30, 2010
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repurchase of stock, shares | 0 us-gaap_StockRepurchasedDuringPeriodShares | 0 us-gaap_StockRepurchasedDuringPeriodShares | 0 us-gaap_StockRepurchasedDuringPeriodShares | 2,600,000 us-gaap_StockRepurchasedDuringPeriodShares |  |  |
Repurchase of stock, value |  |  |  | $ 31.2 us-gaap_StockRepurchasedDuringPeriodValue |  |  |
Common stock average price |  |  |  | $ 11.84 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Maximum |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | 200 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  |  | $ 0.06 us-gaap_DividendsPayableAmountPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Dividends payable, date to be paid |  |  |  |  |  | Mar. 24, 2015 |
Dividends payable, record date |  |  |  |  |  | Feb. 27, 2015 |
Stock repurchase program, intend to repurchase |  |  |  |  |  | 300 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Repurchase of stock, shares |  |  |  |  | 900,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Repurchase of stock, value |  |  |  |  | 16.9 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Common stock average price |  |  |  |  | $ 19.44 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Subsequent Event | Maximum |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 500 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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, 31 -Article 5 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |