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Long-Term Debt - Schedule of Debt Restated for Adoption of New Accounting Standard (Parenthetical) (Detail) - USD ($)	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Borrowings	$ 250,000,000
Senior Notes Due 2020 [Member] | Audited [Member]
Debt Instrument [Line Items]
Borrowings			$ 250,000,000
Senior Notes Due 2020 [Member] | Restated [Member]
Debt Instrument [Line Items]
Borrowings			250,000,000
Senior Secured Term Loan B [Member]
Debt Instrument [Line Items]
Borrowings	545,000,000	$ 575,000,000
Senior Secured Term Loan B [Member] | Audited [Member]
Debt Instrument [Line Items]
Borrowings			575,000,000
Senior Secured Term Loan B [Member] | Restated [Member]
Debt Instrument [Line Items]
Borrowings			575,000,000
Senior Secured Revolving Facility [Member]
Debt Instrument [Line Items]
Borrowings	$ 133,000,000	$ 100,000,000
Senior Secured Revolving Facility [Member] | Audited [Member]
Debt Instrument [Line Items]
Borrowings			100,000,000
Senior Secured Revolving Facility [Member] | Restated [Member]
Debt Instrument [Line Items]
Borrowings			100,000,000
ASU 2015-13 Reclass [Member] | Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Borrowings			250,000,000
ASU 2015-13 Reclass [Member] | Senior Secured Term Loan B [Member]
Debt Instrument [Line Items]
Borrowings			575,000,000
ASU 2015-13 Reclass [Member] | Senior Secured Revolving Facility [Member]
Debt Instrument [Line Items]
Borrowings			$ 100,000,000

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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