Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.6.0.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Line Items]      
Depreciation and amortization $ 139,795 $ 156,194 $ 145,121
Total income tax expense (benefit) 74,170 22,313 $ 24,076
Valuation Allowances and Reserves, Period Increase (Decrease) 117,707 40,600  
Liability for unrecognized tax benefits 4,628 7,837  
Accrued interest and penalties related to uncertain tax positions 1,900 3,400  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 800    
Unrecognized Tax Benefits, Income Tax Penalties Expense $ 700    
Alaska Drilling Rigs [Member]      
Income Tax Disclosure [Line Items]      
Depreciation and amortization   $ 24,700