Stockholders' Equity - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 19, 2016	Jan. 31, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 29, 2017	Dec. 20, 2016	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)	90,000,000				90,000,000	90,000,000
Common stock, shares outstanding (in shares)	27,206,162				29,058,117	27,206,162
Loss on extinguishment of debt					$ (1,797,000)	$ (1,989,000)
Long-term debt - less current portion	$ 325,969,000				$ 275,587,000	$ 325,969,000
Preferred Stock, shares authorized (in shares)									10,000,000
Preferred Stock, shares issued (in shares)	0				0	0
Preferred Stock, shares outstanding (in shares)	0				0	0
Compensation expense					$ 5,300,000	$ 3,200,000	$ 4,000,000
Compensation expense, net of tax					$ 4,200,000	2,900,000	2,800,000
Weighted average remaining period					2 years
Stock price								$ 50.40
Fair market value of the shares					$ 5,800,000	$ 3,800,000	$ 3,500,000
Stock repurchase program, authorized amount										$ 50,000,000
Stock repurchase program, expiration period		Dec. 31, 2019
Repurchased shares of common stock					0	177,053
Treasury stock acquired, average cost per share (in USD per share)						$ 25.65
Cash dividends declared (in USD per share)					$ 0.66	0.60	$ 0.57
Cash dividends paid (in USD per share)					$ 0.66	$ 0.60
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount		$ 30,000,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock awards					$ 11,200,000
2004 Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares subject to outstanding awards (in shares)					750,576
2014 Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for delivery pursuant to the grant of awards (in shares)					860,793
Restricted shares for vesting period					5 years
Convertible Notes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Notes redemption date					Jan. 12, 2017	Jan. 12, 2017
Conversion of notes into shares, amount	$ 39,300,000					$ 39,300,000
Surrender of notes for conversion end date					Jan. 09, 2017	Jan. 09, 2017
Conversion of notes into additional shares	1,500,000		1,700,000			1,500,000
Loss on extinguishment of debt	$ (1,900,000)			$ (1,800,000)		$ 1,900,000
Long-term debt - less current portion	$ 42,900,000					$ 42,900,000
Redemption of debt			$ 900,000