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Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Feb. 13, 2017
Dec. 31, 2016
Sep. 09, 2013
Mar. 23, 2012
Carrying Amount          
Assets:          
Cash and cash equivalents $ 53,533   $ 24,690    
Derivative instruments (other current assets) 1,150   1,094    
Liabilities:          
Derivative instruments (accrued liabilities) 115   244    
Fair Value          
Assets:          
Cash and cash equivalents 53,533   24,690    
Derivative instruments (other current assets) 1,150   1,094    
Liabilities:          
Derivative instruments (accrued liabilities) 115   244    
Bank Borrowings [Member] | Carrying Amount          
Liabilities:          
Long term debt fair value 903,945   771,192    
Bank Borrowings [Member] | Fair Value          
Liabilities:          
Long term debt fair value 903,945   771,192    
Senior Notes [Member] | 5½% Senior Notes [Member]          
Liabilities:          
Stated interest rate       5.50%  
Senior Notes [Member] | 5% Senior Notes [Member]          
Liabilities:          
Stated interest rate         5.00%
Senior Notes [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member]          
Liabilities:          
Stated interest rate   4.75%      
Senior Notes [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member]          
Liabilities:          
Stated interest rate   3.25%      
Senior Notes [Member] | Carrying Amount | 5½% Senior Notes [Member]          
Liabilities:          
Long term debt fair value 300,000   300,000    
Senior Notes [Member] | Carrying Amount | 5% Senior Notes [Member]          
Liabilities:          
Long term debt fair value 280,000   500,000    
Senior Notes [Member] | Carrying Amount | Four and Three Quarters Percent Senior Notes due 2025 [Member]          
Liabilities:          
Long term debt fair value 300,000   0    
Senior Notes [Member] | Carrying Amount | Three and One Quarter Percent Senior Notes due 2025 [Member]          
Liabilities:          
Long term debt fair value 780,325   0    
Senior Notes [Member] | Fair Value | 5½% Senior Notes [Member]          
Liabilities:          
Long term debt fair value 308,301   312,750    
Senior Notes [Member] | Fair Value | 5% Senior Notes [Member]          
Liabilities:          
Long term debt fair value 281,691   510,130    
Senior Notes [Member] | Fair Value | Four and Three Quarters Percent Senior Notes due 2025 [Member]          
Liabilities:          
Long term debt fair value 309,390   0    
Senior Notes [Member] | Fair Value | Three and One Quarter Percent Senior Notes due 2025 [Member]          
Liabilities:          
Long term debt fair value $ 813,793   $ 0