BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURE OF BUSINESS (Details)	6 Months Ended
Jun. 30, 2016 segment building item
NATURE OF BUSINESS
Number of vessels	35
Number of operating segments \| segment	1
VLCCs
NATURE OF BUSINESS
Number of vessels	18
New building construction \| building	10
Suezmax
NATURE OF BUSINESS
Number of vessels	11
Aframax
NATURE OF BUSINESS
Number of vessels	4
Panamax
NATURE OF BUSINESS
Number of vessels	2
Navig8 Limited
NATURE OF BUSINESS
Ownership percentage in outstanding common shares (as a percent)	4.00%
Navig8 Crude Tankers Inc
NATURE OF BUSINESS
Number Of Time Charters	2

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration