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Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 12,500  
Total debt 917,363 $ 569,387
Less current maturities (16,619) (4,804)
Long-term debt 900,744 564,583
Carrying Amount | Revolving Credit Facility | Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt 104,600 0
Long-term Debt, Fair Value 104,600 0
Carrying Amount | Capital Lease Obligations    
Debt Instrument [Line Items]    
Capital Lease Obligations 20,888 24,549
Carrying Amount | Senior Notes | 3.875% Senior Notes    
Debt Instrument [Line Items]    
Total debt 272,734 272,394
Carrying Amount | Senior Notes | 4.375% Senior Notes    
Debt Instrument [Line Items]    
Total debt 272,959 272,444
Carrying Amount | Term Loan [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Total debt 246,182 0
Long-term Debt, Fair Value 246,182 0
Estimate of Fair Value Measurement    
Debt Instrument [Line Items]    
Long-term Debt, Fair Value 927,665 568,994
Less current maturities (16,619) (4,804)
Long-term debt 911,046 564,190
Estimate of Fair Value Measurement | Capital Lease Obligations    
Debt Instrument [Line Items]    
Long-term Debt, Fair Value 20,888 24,549
Estimate of Fair Value Measurement | Senior Notes | 3.875% Senior Notes    
Debt Instrument [Line Items]    
Long-term Debt, Fair Value 278,080 274,450
Estimate of Fair Value Measurement | Senior Notes | 4.375% Senior Notes    
Debt Instrument [Line Items]    
Long-term Debt, Fair Value $ 277,915 $ 269,995