Debt - Additional Information (Detail) - USD ($)			6 Months Ended
	Feb. 29, 2016	Nov. 10, 2011	Jun. 30, 2016	Dec. 31, 2015	Aug. 20, 2013
Debt Instrument [Line Items]
Credit facility, interest rate description			The applicable margin for borrowings under the Revolving Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.50% to 1.50% with respect to base rate borrowings and between 1.50% and 2.50% with respect to LIBOR based borrowings. Interest is due and payable monthly. The interest rate in effect at June 30, 2016 for the Credit Facility was 2.72%.
Credit facility, interest rate margin above federal fund rate			1.00%
Credit facility, interest rate margin above one-month LIBOR rate			1.00%
Credit facility, borrowing rate			2.72%
Other current assets			$ 17,941,000	$ 21,637,000
Current portion of long-term debt			90,198,000	89,710,000
Other noncurrent assets			37,439,000	33,658,000
Long-term debt			633,155,000	834,449,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount outstanding			22,000,000
Unused borrowings			203,000,000
Credit facilities, maximum borrowing capacity	$ 250,000,000
Current borrowing capacity due letter of credit	225,000,000
Term Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility amount outstanding			401,400,000
Letters of Credit
Debt Instrument [Line Items]
Unused borrowings			25,000,000
Credit facilities, maximum borrowing capacity	$ 25,000,000
Credit facility period	6 months
Credit facility automatically renewal date	Jun. 15, 2016
ASU 2015-03 [Member]
Debt Instrument [Line Items]
Other current assets				(5,600,000)
Current portion of long-term debt				5,600,000
Other noncurrent assets				(8,800,000)
Long-term debt				$ 8,800,000
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes amount outstanding			$ 300,000,000		$ 300,000,000
Issue price percentage of senior notes of the principal amount					100.00%
Percentage of interest rate on notes					6.375%
Maturity date of senior notes			Aug. 15, 2020
Credit Agreement | Minimum
Debt Instrument [Line Items]
Credit facility, interest rate margin above base rate			0.50%
Credit facility, interest rate margin above LIBOR rate			1.50%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Credit facility, interest rate margin above base rate			1.50%
Credit facility, interest rate margin above LIBOR rate			2.50%
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity		$ 250,000,000
Credit facilities, maturity		5 years
Credit Facility maturity date		Aug. 20, 2018
Credit Agreement | Term Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity		$ 650,000,000
Credit facilities, maturity		5 years
Credit Facility maturity date		Aug. 20, 2018
Parent Company and Domestic Subsidiaries [Member]
Debt Instrument [Line Items]
Percentage of capital stock pledged as collateral			100.00%
Foreign Subsidiaries [Member]
Debt Instrument [Line Items]
Percentage of capital stock pledged as collateral			65.00%