Debt - Additional Information (Detail) - USD ($)					12 Months Ended
	Dec. 31, 2017	Jun. 27, 2017	Feb. 24, 2017	Aug. 20, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 15, 2017	Oct. 26, 2016	Feb. 29, 2016
Debt Instrument [Line Items]
Proceeds from revolving credit facility					$ 67,000,000	$ 76,000,000	$ 298,000,000
Proceeds from term portion of credit agreement					$ 415,000,000
Credit facility, interest rate description					The applicable margin for borrowings under the Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.25% to 1.25% with respect to base rate borrowings and between 1.25% and 2.25% with respect to LIBOR rate borrowings. Interest is due and payable monthly. The interest rate in effect at December 31, 2017 for the Credit Facility was 3.07%.
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	3.07%				3.07%
Credit Facility maturity date					Feb. 24, 2022
Description of credit agreement amendment terms		The amendment revised the definition of "Consolidated EBITDA" to exclude the expense from the BHMI judgment and related fees, expenses, and interest thereto, up to $50.0 million from the calculation in the period recorded.			The amendment revised the definition of "Consolidated EBITDA" to exclude the expense from the BHMI judgment and related fees, expenses, and interest thereto, up to $50.0 million from the calculation in the period recorded.
Maximum
Debt Instrument [Line Items]
BHMI judgment and related fees, expenses, and interest excluded from Consolidated EBITDA definition		$ 50,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility amount outstanding	$ 2,000,000				$ 2,000,000
Unused borrowings	498,000,000				498,000,000
Proceeds from revolving credit facility	181,000,000
Term Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility amount outstanding	394,300,000				394,300,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity								$ 5,000,000	$ 7,500,000	$ 25,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes amount outstanding	300,000,000			$ 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. 20, 2020	Aug. 15, 2020
Credit Agreement [Member] | Minimum
Debt Instrument [Line Items]
Credit facility, interest rate margin above base rate					0.25%
Credit facility, interest rate margin above LIBOR rate					1.25%
Credit Agreement [Member] | Maximum
Debt Instrument [Line Items]
Credit facility, interest rate margin above base rate					1.25%
Credit facility, interest rate margin above LIBOR rate					2.25%
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity			$ 500,000,000
Credit facilities, maturity			5 years
Proceeds from revolving credit facility			$ 12,000,000
Credit Agreement [Member] | Term Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity			$ 415,000,000
Credit facilities, maturity			5 years
Proceeds from term portion of credit agreement			$ 415,000,000
Three-year License Agreement [Member]
Debt Instrument [Line Items]
Financed internally-used software							$ 20,400,000
License agreement period							3 years
Annual payments due date					Through November 2018
Total other liabilities	1,900,000				$ 1,900,000	9,000,000
Other current liabilities	1,500,000				1,500,000	7,300,000
Other noncurrent liabilities	$ 400,000				$ 400,000	$ 1,700,000
Parent Company and Domestic Subsidiaries [Member]
Debt Instrument [Line Items]
Percentage of capital stock pledged as collateral	100.00%				100.00%
Foreign Subsidiaries [Member]
Debt Instrument [Line Items]
Percentage of capital stock pledged as collateral	65.00%				65.00%