Aggregate dividends declared during the period for each share of common stock outstanding.

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 S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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+ 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

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Stockholders' Equity - Schedule of Quarterly Cash Dividends to Common Stockholders (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2013	Mar. 31, 2014	Jun. 30, 2014	May 31, 2014	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends declared	$ 0.62	$ 0.60	$ 6.07
Q2 2013 Declaration [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend record date	Jun. 20, 2013
Dividend payable date	Jul. 01, 2013
Cash dividends declared				$ 0.20
Q3 2013 Declaration [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend record date	Sep. 20, 2013
Dividend payable date	Oct. 01, 2013
Cash dividends declared					$ 0.20
Q4 2013 Declaration [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend record date	Dec. 20, 2013
Dividend payable date	Jan. 03, 2014
Cash dividends declared						$ 0.20
Q1 2014 Declaration [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend record date	Mar. 20, 2014
Dividend payable date	Apr. 01, 2014
Cash dividends declared							$ 0.20
Q2 2014 Declaration [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend record date	Jun. 20, 2014
Dividend payable date	Jul. 01, 2014
Cash dividends declared								$ 0.21	$ 0.21
Q3 2014 Declaration [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend record date	Sep. 29, 2014
Dividend payable date	Oct. 06, 2014
Cash dividends declared										$ 0.21