Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended																3 Months Ended	12 Months Ended		12 Months Ended					12 Months Ended				12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Appreciation Rights [Member]	Dec. 31, 2012 Stock Appreciation Rights [Member]	Dec. 31, 2011 Stock Appreciation Rights [Member]	Dec. 31, 2013 Time-Based Stock Appreciation Rights [Member]	Dec. 31, 2012 Time-Based Stock Appreciation Rights [Member]	Dec. 31, 2011 Time-Based Stock Appreciation Rights [Member]	Dec. 31, 2013 Performance-Based Stock Appreciation Rights [Member]	Dec. 31, 2012 Performance-Based Stock Appreciation Rights [Member]	Dec. 31, 2011 Performance-Based Stock Appreciation Rights [Member]	Dec. 31, 2013 Time-Based Restricted Stock Units [Member]	Dec. 31, 2012 Time-Based Restricted Stock Units [Member]	Dec. 31, 2011 Time-Based Restricted Stock Units [Member]	Dec. 31, 2013 Performance Units [Member]	Dec. 31, 2013 Performance-Based Restricted Stock Units [Member]	Dec. 31, 2013 Performance-Based Restricted Stock Units [Member]	Dec. 31, 2012 Performance-Based Restricted Stock Units [Member]	Dec. 31, 2013 Market Performance Units [Member]	Dec. 31, 2013 Stock Options [Member]	Jan. 31, 2014 Subsequent Event [Member] Performance Units [Member]	Dec. 31, 2013 First Quarter of 2014 [Member] Performance-Based Restricted Stock Units [Member]	Dec. 31, 2013 First Quarter of 2015 [Member] Performance-Based Restricted Stock Units [Member]	Dec. 31, 2013 2013 Targets [Member] Performance-Based Restricted Stock Units [Member]	Dec. 31, 2013 Maximum [Member] Performance Units [Member]	Dec. 31, 2013 Minimum [Member] Performance Units [Member]	Dec. 31, 2013 2006 LTIP [Member]	Dec. 31, 2013 2006 LTIP [Member] Stock Appreciation Rights [Member]	Dec. 31, 2013 2006 LTIP [Member] Maximum [Member]	Dec. 31, 2013 2004 Stock Option Plan [Member]	Dec. 31, 2013 2004 Stock Option Plan [Member] Maximum [Member]	Dec. 31, 2013 2004 Stock Option Plan [Member] Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant																												3,338,701		9,714,827
Stock-based compensation expense	$ 2,973	$ 1,801	$ 1,914	$ 1,659	$ 1,475	$ 1,488	$ 1,412	$ 993	$ 1,059	$ 247	$ 482	$ 429	$ 357	$ 326	$ 426	$ 324		$ 633
Stock-based compensation, capitalized	130	80	57
Unrecognized compensation costs for all share-based payment arrangements	2,910						2,326			47			65				472	472
Stock option plan maximum term of period																													10 years
Stock appreciation rights expiration period																													10 years
Company granted time-based SARs							755,500			120,500			80,270				55,000	313,000							258,000
Company time-based SARs vesting period							Through June 2016			Through the first quarter of 2014.							First quarter of 2015	First quarter of 2014
Weighted-average grant date fair value of SARs							$ 3.31	$ 2.23	$ 1.68	$ 2.52	$ 2.06	$ 2.00	$ 3.32	$ 3.12			$ 4.26	$ 4.26
Intrinsic value of SARs							1,001			290
Number of shares vesting during period on SARs										77,200								201,538
Percentage of shares vesting during period on stock units																	100.00%
Unrecognized compensation expected to be recognized																							160	312
Maximum percentage of MPUs for senior executives																15.00%
Term of MPUs																				3 years												10 years	4 years
Fair value period of MPUs																3 years
Common stock issued, shares	48,216,480	46,783,568																				33,594
Risk-free interest rate of MPUs																										0.78%	0.13%
Estimated volatility factor of MPUs																40.00%
Expected dividends of MPUs																0
Stock option expiration period																															10 years
Intrinsic value of stock options exercised																					$ 1,629										$ 203