Long-Term Debt - Additional information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	May 22, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 27, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Redemption price percentage of principal amount of notes redeemed	100.00%
Required offer price to repurchase senior notes if change of control repurchase event				101.00%
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation				$ 200,000,000
Additional interest expense		$ 364,000	$ 340,000	720,000	$ 672,000
Minimum
Debt Instrument [Line Items]
Reduction of consolidated debt in the debt ratio calculation				$ 50,000,000
Including Acquisition Bridge Debt | Maximum
Debt Instrument [Line Items]
Debt covenant		3.50		3.50
Excluding Acquisition Bridge Debt | Maximum
Debt Instrument [Line Items]
Debt covenant		3.75		3.75
Revolving Facility
Debt Instrument [Line Items]
Credit facility commitment		$ 700,000,000		$ 700,000,000
Senior unsecured revolving facility, maturity period				5 years
Outstanding letters of credit		$ 2,507,000	2,507,000	$ 2,507,000	2,507,000		$ 2,507,000
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Senior notes, principal amount	$ 300,000,000
Maturity year	2020			2017
3.45% Senior Notes, Due 2027
Debt Instrument [Line Items]
Senior notes, principal amount	$ 300,000,000
Maturity year	2027			2027
Interest rate on notes	3.45%	3.45%		3.45%
Floating Rate Notes, Due 2020
Debt Instrument [Line Items]
Maturity year				2020
Debt instrument, maturity date				May 22, 2020
Trade Receivable Facility
Debt Instrument [Line Items]
Debt instrument maturity period				Sep. 27, 2017
Debt instrument maturity, description				Management intends to renew the Trade Receivable Facility beyond September 27, 2017.
Credit facility borrowing base		$ 422,624,000	$ 391,600,000	$ 422,624,000	$ 391,600,000		$ 333,302,000
Trade Receivable Facility | Scenario Forecast
Debt Instrument [Line Items]
Credit facility commitment						$ 300,000,000
6.65% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity year				2018
Interest rate on notes		6.65%		6.65%
Debt instrument, maturity date				Apr. 15, 2018
Debt instrument maturity, description				The 6.65% Senior Notes, due 2018, have been classified as a noncurrent liability as the Company has the intent and ability to refinance on a long-term basis before or at its maturity on April 15, 2018.
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity year				2018
Interest rate on notes		6.60%		6.60%
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements				$ 1,400,000
Three-month LIBOR | Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Basis spread on variable rate	0.65%
London Interbank Offered Rate(LIBOR) | Trade Receivable Facility
Debt Instrument [Line Items]
Basis spread on variable rate				0.725%
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption description				The 3.450% Senior Notes may be redeemed in whole or in part prior to March 1, 2027 at a make-whole redemption price
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, redemption description				or on or after March 1, 2027 at a redemption price equal to 100% of the principal amount of the notes to be redeemed, in either case plus unpaid interest, if any, accrued thereon to, but excluding, the date of redemption.