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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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Related-Party Transactions - Additional Information (Detail) - USD ($)																				1 Months Ended			12 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	Oct. 06, 2015	Sep. 16, 2015	Jul. 01, 2015	Jun. 10, 2015	Apr. 01, 2015	Mar. 03, 2015	Jan. 22, 2015	Jan. 05, 2015	Oct. 06, 2014	Jul. 01, 2014	Apr. 01, 2014	Sep. 30, 2014	May 31, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 07, 2015	Dec. 01, 2009
Related Party Transaction [Line Items]
Cash dividends declared per share																							$ 0.73	$ 0.84	$ 0.62
Dividends paid to stockholders																							$ 65,306,000	$ 72,318,000	$ 72,113,000
Q4 2015 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share								$ 0.21															$ 0.21
Cash dividends declared date																							Jan. 05, 2016
Cash dividends record date																							Jan. 15, 2016
Cash dividends payable date																							Jan. 22, 2016
Q1 2016 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share						$ 0.21																	$ 0.21
Cash dividends declared date																							Feb. 22, 2016
Cash dividends record date																							Mar. 14, 2016
Cash dividends payable date																							Apr. 01, 2016
Q2 2016 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share				$ 0.21																			$ 0.21
Cash dividends declared date																							Jun. 08, 2016
Cash dividends record date																							Jun. 20, 2016
Cash dividends payable date																							Jul. 01, 2016
Q3 2016 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share		$ 0.10																					$ 0.10
Cash dividends declared date																							Sep. 19, 2016
Cash dividends record date																							Sep. 29, 2016
Cash dividends payable date																							Oct. 07, 2016
Q4 2014 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share																$ 0.21								$ 0.21
Cash dividends declared date																								Jan. 05, 2015
Cash dividends record date																								Jan. 13, 2015
Cash dividends payable date																								Jan. 22, 2015
Q1 2015 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share														$ 0.21										$ 0.21
Cash dividends declared date																								Mar. 03, 2015
Cash dividends record date																								Mar. 13, 2015
Cash dividends payable date																								Apr. 01, 2015
Q2 2015 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share												$ 0.21												$ 0.21
Cash dividends declared date																								Jun. 10, 2015
Cash dividends record date																								Jun. 22, 2015
Cash dividends payable date																								Jul. 01, 2015
Q3 2015 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share										$ 0.21														$ 0.21
Cash dividends declared date																								Sep. 16, 2015
Cash dividends record date																								Sep. 29, 2015
Cash dividends payable date																								Oct. 06, 2015
Q1 2014 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share																						$ 0.20			$ 0.20
Cash dividends record date																									Mar. 20, 2014
Cash dividends payable date																									Apr. 01, 2014
Cash dividends declare date																									2014-03
Q2 2014 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share																					$ 0.21				$ 0.21
Cash dividends record date																									Jun. 20, 2014
Cash dividends payable date																									Jul. 01, 2014
Cash dividends declare date																									2014-05
Q3 2014 Declaration [Member]
Related Party Transaction [Line Items]
Cash dividends declared per share																				$ 0.21					$ 0.21
Cash dividends record date																									Sep. 29, 2014
Cash dividends payable date																									Oct. 06, 2014
Cash dividends declare date																									2014-09
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			$ 280,000,000
Blackstone and Affiliates [Member] \| Q4 2015 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders							$ 4,095,000
Blackstone and Affiliates [Member] \| Q1 2016 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders					$ 4,095,000
Blackstone and Affiliates [Member] \| Q2 2016 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders			$ 4,095,000
Blackstone and Affiliates [Member] \| Q3 2016 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders	$ 1,950,000
Blackstone and Affiliates [Member] \| Q4 2014 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders															$ 4,095,000
Blackstone and Affiliates [Member] \| Q1 2015 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders													$ 4,095,000
Blackstone and Affiliates [Member] \| Q2 2015 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders											$ 4,095,000
Blackstone and Affiliates [Member] \| Q3 2015 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders									$ 4,095,000
Blackstone and Affiliates [Member] \| Q1 2014 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders																			$ 7,849,000
Blackstone and Affiliates [Member] \| Q2 2014 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders																		$ 4,252,000
Blackstone and Affiliates [Member] \| Q3 2014 Declaration [Member]
Related Party Transaction [Line Items]
Dividends paid to stockholders																	$ 4,095,000
Blackstone and Affiliates [Member] \| Term B-2 Loans [Member]
Related Party Transaction [Line Items]
Debt instrument, balance																							$ 25,000,000	$ 77,000,000
Blackstone and Affiliates [Member] \| Term B-3 Loans [Member]
Related Party Transaction [Line Items]
Debt instrument, balance																								$ 9,000,000