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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified |
12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2013
Minimum [Member]
|
Dec. 31, 2013
Maximum [Member]
|
Dec. 31, 2013
Technical management fee [Member]
|
Dec. 31, 2012
Technical management fee [Member]
|
Dec. 31, 2011
Technical management fee [Member]
|
Dec. 31, 2012
Prior period reclassification from general and administrative expense [Member]
Technical management fee [Member]
|
Dec. 31, 2011
Prior period reclassification from general and administrative expense [Member]
Technical management fee [Member]
|
Jun. 26, 2012
Dropdown Predecessor [Member]
Vessel
|
Jun. 15, 2012
Dropdown Predecessor [Member]
Vessel
|
Jun. 30, 2012
Dropdown Predecessor [Member]
Vessel
|
Dec. 31, 2012
Dropdown Predecessor [Member]
|
Dec. 31, 2011
Dropdown Predecessor [Member]
|
Jun. 30, 2012
Dropdown Predecessor [Member]
Class A [Member]
|
Jun. 26, 2012
Dropdown Predecessor [Member]
Class A [Member]
|
Jun. 30, 2012
Dropdown Predecessor [Member]
Acquired In Period [Member]
Vessel
|
Dec. 31, 2012
Dropdown Predecessor [Member]
Technical management fee [Member]
|
Dec. 31, 2011
Dropdown Predecessor [Member]
Technical management fee [Member]
|
Dec. 31, 2012
Dropdown Predecessor [Member]
Prior period reclassification from general and administrative expense [Member]
Technical management fee [Member]
|
Dec. 31, 2011
Dropdown Predecessor [Member]
Prior period reclassification from general and administrative expense [Member]
Technical management fee [Member]
|
Jun. 30, 2012
Product tankers [Member]
Dropdown Predecessor [Member]
Vessel
|
Jun. 30, 2012
Conventional oil tankers [Member]
Dropdown Predecessor [Member]
Vessel
|
|
| Business Acquisition [Line Items] | ||||||||||||||||||||||||
| Aggregate purchase price | $ 454,200,000 | |||||||||||||||||||||||
| Assumption of outstanding debt | 428,100,000 | |||||||||||||||||||||||
| Number of vessels | 3 | 10 | 13 | 13 | ||||||||||||||||||||
| Number of vessels acquired | 6 | 7 | ||||||||||||||||||||||
| Business acquisition, number of shares issued | 4.5 | |||||||||||||||||||||||
| Business acquisition, cash paid | 0 | 9,509,000 | 0 | 1,100,000 | ||||||||||||||||||||
| Value of Class A common shares | 25,000,000 | |||||||||||||||||||||||
| Business acquisition, Class A common share price per share agreed upon | $ 5.60 | |||||||||||||||||||||||
| Value of Class A common shares | 18,300,000 | |||||||||||||||||||||||
| Business acquisition, Class A common share price per share on closing date | $ 4.11 | |||||||||||||||||||||||
| Business acquisition, delta between stock fair value and agreed price | 6,700,000 | |||||||||||||||||||||||
| Business acquisition, assumed working capital | 8,400,000 | |||||||||||||||||||||||
| Dropdown predecessor debt prepaid prior to acquisition | 106,900,000 | |||||||||||||||||||||||
| Decrease in the Company's net income due to the common control exchanges | 9,200,000 | 104,000,000 | ||||||||||||||||||||||
| Increase in the Company's revenue due to the common control exchanges | 42,200,000 | 94,100,000 | ||||||||||||||||||||||
| Vessel operating expenses | 91,667,000 | 96,160,000 | 92,543,000 | 5,637,000 | 4,379,000 | 3,064,000 | 7,000,000 | 8,500,000 | 2,566,000 | 5,390,000 | 2,566,000 | 5,390,000 | ||||||||||||
| General and administrative | 10,783,000 | 5,492,000 | 3,420,000 | 2,126,000 | ||||||||||||||||||||
| Long-term debt | 719,388,000 | 710,455,000 | 108,700,000 | |||||||||||||||||||||
| Interest expense | 10,023,000 | 20,009,000 | 40,539,000 | 11,700,000 | 36,400,000 | |||||||||||||||||||
| Investment in a joint venture | 50.00% | |||||||||||||||||||||||
| Useful life of vessels | 25 years | |||||||||||||||||||||||
| Depreciation of vessels and equipment excluding amortization of dry-docking expenditure | $ 39,200,000 | $ 63,400,000 | $ 65,800,000 | |||||||||||||||||||||
| Period to dry dock | 2 years 6 months | 5 years | ||||||||||||||||||||||