Registration of securities issued in business combination transactions

Acquisitions ITS - Preliminary Allocation of Consideration Transferred (Detail)

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Acquisitions ITS - Preliminary Allocation of Consideration Transferred (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 2 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Apr. 22, 2013
ITS [Member]
Business Acquisition [Line Items]                  
Cash and cash equivalents                 $ 7,009,000
Accounts and notes receivable, net                 48,795,000 [1]
Other current assets                 1,803,000
Accounts payable and accrued liabilities                 (39,156,000)
Accrued income taxes                 (1,251,000)
Working capital excluding rig materials and supplies                 17,200,000
Rig materials and supplies                 11,514,000
Property, plant and equipment, net                 70,339,000 [2]
Investment in joint venture                 4,134,000
Other noncurrent assets                 2,818,000
Total tangible assets                 106,005,000
Deferred income tax assets - current                 222,000
Deferred income tax assets - noncurrent                 14,153,000 [3]
Intangible assets                  
Trade name, developed technology, and customer relationship                 10,000,000
Indefinite-lived intangible assets                 200,000
Total assets acquired                 130,580,000
Other long-term liabilities                 (211,000)
Long-term deferred tax liability                 (2,661,000)
Net assets acquired                 127,708,000
Less: Noncontrolling interest                 (2,708,000) [4]
Total consideration transferred                 125,000,000
Accounts and notes receivable, gross                 54,700,000
Adjustment to record property, plant and equipment to fair value 170,000,000       170,000,000   43,700,000    
Increase in deferred income tax asset   12,872,000 8,403,000 15,837,000 (48,375,000) (1,308,000) 7,700,000    
Intangible assets acquired                 10,000,000
Weighted average useful life             3 years 4 months 24 days 3 years  
Impairment of non-controlling interest             $ 1,000,000    
[1] Gross contractual amounts receivable totaled $54.7 million as of the acquisition date.
[2] We recorded an adjustment of $43.7 million to reduce the historical carrying value of the acquired property, plant and equipment to its estimated fair value.
[3] In connection with the ITS Acquisition, we recorded a $7.7 million adjustment to increase deferred income tax assets primarily related to the differences between acquisition date estimated fair value and tax basis of acquired property, plant and equipment.
[4] We recorded an adjustment of $1.0 million to write-down the noncontrolling interest to its estimated fair value. The estimated fair value of the noncontrolling interest was calculated as a percentage of the net assets acquired related to certain subsidiaries in which ITS holds less than a 100 percent controlling interest. The fair value of the net assets of these subsidiaries was primarily based on the income approach valuation model.