Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Line Items]      
Decrease in valuation allowance $ 2,000,000 $ 1,700,000  
Depreciation and amortization 134,053,000 113,017,000 112,136,000
Total income tax expense (benefit) 25,608,000 33,879,000 (14,767,000)
Non-cash pretax impairment charge relating to AADU rigs in Alaska 0 0 170,000,000
Increased valuation allowance     2,500,000
Liability for unrecognized tax benefits 12,209,000 10,030,000  
Unrecognized tax benefits 5,400,000    
Accrued interest and penalties related to uncertain tax positions 7,900,000 7,000,000  
Increase of interest 900,000    
Internal Revenue Service (IRS) [Member]
      
Income Tax Disclosure [Line Items]      
Total income tax expense (benefit)   1,700,000  
Foreign Tax Authority [Member]
      
Income Tax Disclosure [Line Items]      
Reclassifications   1,300,000 5,600,000
Federal And State Jurisdiction [Member]
      
Income Tax Disclosure [Line Items]      
Total income tax expense (benefit)     (60,900,000)
Mexico [Member] | Foreign Tax Authority [Member]
      
Income Tax Disclosure [Line Items]      
Total income tax expense (benefit) (3,300,000)    
ALASKA [Member]
      
Income Tax Disclosure [Line Items]      
Depreciation and amortization $ 20,900,000 $ 7,700,000