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

Reference 1: 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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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

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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Related-Party Transactions - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended		0 Months Ended
	Mar. 03, 2015	Jan. 05, 2015	Mar. 31, 2015	Mar. 31, 2014	Jan. 22, 2015	Apr. 01, 2015
Related Party Transaction [Line Items]
Cash dividends declared per share	$ 0.21	$ 0.21	$ 0.42	$ 0.20
Dividends paid to stockholders			$ 18,098us-gaap_PaymentsOfDividendsCommonStock	$ 17,691us-gaap_PaymentsOfDividendsCommonStock
Cash dividends record date	Mar. 13, 2015	Jan. 13, 2015
Cash dividends paid date	Apr. 01, 2015	Jan. 22, 2015
Blackstone and Affiliates [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders					4,095
Blackstone and Affiliates [Member] \| Subsequent Event [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders						$ 4,095