Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended								12 Months Ended						0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Restricted Shares [Member]	Dec. 31, 2012 Restricted Shares [Member]	Jan. 23, 2013 Non-Qualified Stock Option Award [Member]	Dec. 31, 2013 Non-Qualified Stock Option Award [Member]	Dec. 31, 2012 Non-Qualified Stock Option Award [Member]	Dec. 31, 2013 Stock Option [Member]	Dec. 31, 2013 Stock Appreciation Rights [Member]	Dec. 31, 2012 Stock Appreciation Rights [Member]	Dec. 31, 2011 Stock Appreciation Rights [Member]	Dec. 31, 2013 Stock Options and Stock Appreciation Rights [Member]	Dec. 31, 2012 Stock Options and Stock Appreciation Rights [Member]	Dec. 31, 2013 2010 Plan [Member]	Dec. 31, 2013 2010 Plan [Member] Restricted Shares [Member]	Dec. 31, 2012 2010 Plan [Member] Restricted Shares [Member] Mr Albright [Member]	Dec. 31, 2011 2010 Plan [Member] Restricted Shares [Member] Mr Albright [Member]	Dec. 31, 2012 2010 Plan [Member] Restricted Shares [Member] Mr Patten [Member]	Dec. 31, 2011 2010 Plan [Member] Restricted Shares [Member] Mr Patten [Member]	Jan. 23, 2013 2010 Plan [Member] Non-Qualified Stock Option Award [Member]	Dec. 31, 2013 2010 Plan [Member] Non-Qualified Stock Option Award [Member]	Dec. 31, 2012 2010 Plan [Member] Non-Qualified Stock Option Award [Member] Mr Albright [Member]	Dec. 31, 2011 2010 Plan [Member] Non-Qualified Stock Option Award [Member] Mr Albright [Member]	Dec. 31, 2013 2010 Plan [Member] Non-Qualified Stock Option Award [Member] Mr Patten [Member]	Dec. 31, 2012 2010 Plan [Member] Non-Qualified Stock Option Award [Member] Mr Patten [Member]	Dec. 31, 2011 2010 Plan [Member] Non-Qualified Stock Option Award [Member] Mr Patten [Member]	Dec. 31, 2013 2010 Plan [Member] Stock Option [Member]	Dec. 31, 2013 2001 Plan [Member]	Dec. 31, 2013 2001 Plan [Member] Stock Option [Member]	Dec. 31, 2012 2001 Plan [Member] Stock Option [Member]	Dec. 31, 2013 2001 Plan [Member] Stock Appreciation Rights [Member]	Dec. 31, 2012 2001 Plan [Member] Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period														5 years	5 years
Unrecognized compensation cost related to market condition non-vested restricted shares			$ 44,000
Weighted average period of compensation cost to be recognized	7 months 6 days		1 year 10 months 24 days			1 year 6 months 0 days
Stock based compensation, Shares Granted				17,000												96,000	96,000	17,000	17,000			50,000	50,000		10,000	10,000
Restricted shares vesting description	The restricted shares will vest in six increments based upon the price per share of Company common stock during the term of their employment (or within 60 days after termination of employment by the Company without cause), meeting or exceeding the target trailing 60-day average closing prices ranging from $36 per share for the first increment to $65 per share for the final increment.
Restricted share award closing prices range per share, Minimum	$ 36
Restricted share award closing prices range per share, Maximum	$ 65
Restricted share award average closing prices, period	60 days
Unrecognized compensation cost			181,000
Stock option plan 2001 expiration date																											2010
Expiry of option					(a) the fifth anniversary of the grant date; (b) twelve months after the employee's death or termination for disability; or (c) thirty days after the termination of employment for any reason other than death or disability.	(a) the tenth anniversary of the grant date; (b) twelve months after the employee's death or termination for disability; or (c) thirty days after the termination of employment for any reason other than death or disability.
Stock based compensation, Shares, Granted						51,000	10,000														51,000			10,000
Options granted exercise price																				$ 34.95
Percent of options vested in each anniversaries Description	One-third of these options will vest on each of the first, second, and third anniversaries of the grant date, provided the recipient is an employee of the Company on those dates.
Weighted-average grant-date fair value of options granted						$ 6.58
Intrinsic value of options exercised						166,850		82,604	44,479
Unrecognized compensation related to non-qualified stock option awards						373,000
Common stock could be issued under stock option plan 2001																												500,000
Number of new stock options issued under 2001 plan																												0
Option shares issued under stock appreciation rights									0	0	0
Stock option liability												$ 247,671	$ 265,311