Long-Term Debt - Additional Information - USD Term Loans (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) term_loan vessel	Dec. 31, 2017 USD ($) vessel
Debt Instrument [Line Items]
Carrying amount of long-term debt \| $	$ 3,363,127	$ 3,449,611
Interest at a weighted-average fixed rate	5.10%	4.30%
Secured debt
Debt Instrument [Line Items]
Number of debt instruments	11
Carrying amount of long-term debt \| $	$ 1,500,000	$ 1,400,000
Number of term loans which have balloon or bullet repayments	9
Number of vessels \| vessel	24	22
Secured debt \| Remaining Term Loans \| Fixed Rate
Debt Instrument [Line Items]
Number of debt instruments	2
Secured debt \| Remaining Term Loans \| Three-month LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable rate	0.30%
Debt term (in years)	3 months
Secured debt \| Remaining Term Loans \| Three-month LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable rate	3.50%
Debt term (in years)	6 months
Secured debt \| Term Loan One
Debt Instrument [Line Items]
Debt interest rate	4.41%
Secured debt \| Term Loan One \| Fixed Rate
Debt Instrument [Line Items]
Number of debt instruments	1
Secured debt \| Term Loan Two
Debt Instrument [Line Items]
Debt interest rate	5.37%

Number of debt instruments.

No definition available.

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Balance Type:	na
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- Definition

Number of debt instruments with balloon or bullet payments.

+ References

No definition available.

+ Details

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- Definition

Number Of Vessels

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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