Shareholders' Equity - Schedule of Dividend Declared (Detail) (USD $)	0 Months Ended	12 Months Ended
Aug. 13, 2012	Dec. 31, 2014
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066us-gaap_DividendsPayableAmountPerShare
Record Date	Mar. 19, 2015
Payment Date	Mar. 31, 2015
Record Date One [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.060
Record Date		Dec. 19, 2014
Payment Date		Dec. 30, 2014
Record Date Two [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.060
Record Date		Sep. 16, 2014
Payment Date		Jun. 30, 2014
Record Date Three [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.060
Record Date		Jun. 13, 2014
Payment Date		Jun. 27, 2014
Record Date Four [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.050
Record Date		Mar. 19, 2014
Payment Date		Mar. 31, 2014
Record Date Five [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.050
Record Date		Dec. 17, 2013
Payment Date		Dec. 31, 2013
Record Date Six [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.050
Record Date		Sep. 16, 2013
Payment Date		Sep. 30, 2013
Record Date Seven [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.050
Record Date		Jun. 14, 2013
Payment Date		Jun. 28, 2013
Record Date Eight [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.050
Record Date		Mar. 18, 2013
Payment Date		Mar. 28, 2013
Record Date Nine [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.045
Record Date		Dec. 17, 2012
Payment Date		Dec. 31, 2012
Record Date Ten [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.045
Record Date		Sep. 16, 2012
Payment Date		Sep. 30, 2012
Record Date Eleven [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.035
Record Date		Jun. 14, 2012
Payment Date		Jun. 28, 2012
Record Date Twelve [Member]
Dividends Declared [Line Items]
Dividend Per Share		$ 0.035
Record Date		Mar. 18, 2012
Payment Date		Mar. 28, 2012

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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

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

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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

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