Earnings per Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended											12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	Jun. 30, 2015	[2]	Mar. 31, 2015	Dec. 31, 2014	[3]	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Basic earnings per share, Net Income												$ 49,133	$ 49,919	$ 51,920
Diluted earnings per share, Net Income												$ 49,133	$ 49,919	$ 51,920
Basic earnings per share, Shares												85,860	87,183	87,537
Effect of dilutive incentive-based awards, Shares												121	297	615
Diluted earnings per share, Shares												85,981	87,480	88,152
Basic earnings per share, Per Share Amount	$ (0.13)		$ 1.14	$ 0.07		$ (0.51)	$ (0.29)		$ 1.01	$ 0.43	$ (0.56)	$ 0.57	$ 0.57	$ 0.59
Diluted earnings per share, Per Share Amount	$ (0.13)		$ 1.14	$ 0.07		$ (0.51)	$ (0.29)		$ 1.00	$ 0.43	$ (0.56)	$ 0.57	$ 0.57	$ 0.59

[1] During the fourth quarter of 2015, the Company recorded $2,001 in restructuring and other related costs primarily related to severance costs for certain positions which were eliminated as part of a cost savings initiative. See Note 4–Restructuring Program and Separation Costs for further details.

[2] During the second quarter of 2015, the Company recorded $20,348 in loss on early extinguishment of debt and write-off of discounts and debt issuance costs related to the early redemption of $260,000 of its Senior Notes. See Note 11–Long-Term Debt for further details.

[3] During the fourth quarter of 2014, the Company recorded $10,371 in restructuring and other related costs incurred in connection with the restructuring program which the Company implemented in December 2014. Also during the fourth quarter of 2014, the Company recorded $2,574 in separation costs representing costs incurred pursuant to the previously announced separation of the Company’s Former Chief Executive Officer and President on January 15, 2015. See Note 4–Restructuring Program and Separation Costs for further details.