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Reconciliation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Earnings Available to Common Shareholders	$ 9.4us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1.6us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 12.6us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 10.3us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 0.6us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (0.1)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 10.8us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 24.7us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 21.6us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 18.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted Average Common Shares Outstanding-Basic									13,843us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	13,773us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,669us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus: Diluted Effect of Incremental Shares (000's)									4us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	2us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	3us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted Average Common Shares Outstanding-Diluted									13,847us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	13,775us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,672us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per Share-Basic and Diluted	$ 0.69us-gaap_EarningsPerShareBasicAndDiluted	$ 0.11us-gaap_EarningsPerShareBasicAndDiluted	$ 0.08us-gaap_EarningsPerShareBasicAndDiluted	$ 0.91us-gaap_EarningsPerShareBasicAndDiluted	$ 0.75us-gaap_EarningsPerShareBasicAndDiluted	$ 0.04us-gaap_EarningsPerShareBasicAndDiluted	$ (0.01)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.79us-gaap_EarningsPerShareBasicAndDiluted	$ 1.79us-gaap_EarningsPerShareBasicAndDiluted	$ 1.57us-gaap_EarningsPerShareBasicAndDiluted	$ 1.43us-gaap_EarningsPerShareBasicAndDiluted

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 50

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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-Topic 260

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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