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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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 15
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Related-Party Transactions - Additional Information (Detail) - USD ($)									3 Months Ended		9 Months Ended
	Oct. 07, 2016	Sep. 19, 2016	Jul. 01, 2016	Jun. 08, 2016	Apr. 01, 2016	Feb. 22, 2016	Jan. 22, 2016	Jan. 05, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Apr. 07, 2015	Dec. 01, 2009
Related Party Transaction [Line Items]
Cash dividends declared per share		$ 0.10		$ 0.21		$ 0.21		$ 0.21	$ 0.10	$ 0.21	$ 0.73	$ 0.84
Cash dividends record date		Sep. 29, 2016		Jun. 20, 2016		Mar. 14, 2016		Jan. 15, 2016
Cash dividends payable date		Oct. 07, 2016		Jul. 01, 2016		Apr. 01, 2016		Jan. 22, 2016
Dividends paid to stockholders											$ 56,756,000	$ 54,370,000
Term B-2 Loans [Member]
Related Party Transaction [Line Items]
Debt instrument, balance															$ 1,405,000,000
Term B-3 Loans [Member]
Related Party Transaction [Line Items]
Debt instrument, balance														$ 280,000,000
Blackstone and Affiliates [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders			$ 4,095,000		$ 4,095,000		$ 4,095,000
Blackstone and Affiliates [Member] \| Subsequent Events [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders	$ 1,950,000
Blackstone and Affiliates [Member] \| Term B-2 Loans [Member]
Related Party Transaction [Line Items]
Debt instrument, balance									$ 38,000,000		$ 38,000,000		$ 77,000,000
Blackstone and Affiliates [Member] \| Term B-3 Loans [Member]
Related Party Transaction [Line Items]
Debt instrument, balance													$ 9,000,000