Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended									0 Months Ended				1 Months Ended	12 Months Ended			1 Months Ended				1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 $4.00	Dec. 31, 2013 $12.97	Dec. 31, 2013 Stock Options And Employee Stock Purchase Plan	Dec. 31, 2012 Stock Options And Employee Stock Purchase Plan	Dec. 31, 2011 Stock Options And Employee Stock Purchase Plan	Jul. 31, 2013 Shares under the Employee Stock Purchase Plan	Jan. 31, 2013 Shares under the Employee Stock Purchase Plan	Jul. 31, 2012 Shares under the Employee Stock Purchase Plan	Jan. 31, 2012 Shares under the Employee Stock Purchase Plan	May 30, 2009 Shares under the Employee Stock Purchase Plan	Dec. 31, 2013 Shares under the Employee Stock Purchase Plan	Dec. 31, 2012 Shares under the Employee Stock Purchase Plan	Dec. 31, 2011 Shares under the Employee Stock Purchase Plan	May 30, 2009 Shares under the Employee Stock Purchase Plan Maximum	May 30, 2009 Stock Incentive Plan 1999	Dec. 31, 2013 Shares under the 2009 Stock Incentive Plan	May 30, 2009 Shares under the 2009 Stock Incentive Plan	May 30, 2009 Shares under the 2009 Stock Incentive Plan Maximum	Dec. 31, 2013 Stock options	May 30, 2009 Stock options Maximum	Dec. 31, 2013 Performance based restricted stock President	Dec. 31, 2013 Restricted stock	Dec. 31, 2012 Restricted stock	Dec. 31, 2011 Restricted stock	May 30, 2009 Restricted stock Maximum	May 30, 2009 Restricted stock Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average grant date fair value	$ 3.89
Options vested in period	0
Shares of common stock reserved for issuance															300,000				3,190,737		1,000,000
Stock awards, vesting period																								4 years					5 years	1 year
Options, terms																						10 years
Shares available for future grants															130,432					524,719
Share based compensation expense																							$ 100,000		$ 500,000
Shares
Options outstanding Beginning Balance	201,000
Options granted	150,000
Options exercised	(69,000)
Options forfeited	(1,000)	(161,000)
Options outstanding Ending Balance	281,000	201,000
Weighted Average Exercise Price
Options outstanding Beginning Balance	$ 3.60
Options granted	$ 12.97
Options exercised	$ 2.84
Options forfeited	$ 2.80	$ 18.13
Options outstanding Ending Balance	$ 8.79	$ 3.60
Intrinsic value of options exercised	833,000
Number Outstanding as of December 31, 2013
Number Outstanding as of December 31, 2013	281,000				131,000	150,000
Weighted Average Remaining Contractual Life (in Years)	2 years 9 months 3 days				0 years 5 months 26 days	4 years 8 months 23 days
Weighed Average Exercise Price (usd per share)	$ 8.79				$ 4.00	$ 12.97
Number Exercisable as of December 31, 2013	131,000				131,000
Weighted Average Remaining Contractual Life (in Years)	0 years 5 months 26 days				0 years 5 months 26 days
Weighted Average Exercise Price (usd per share)	$ 4.00				$ 4.00
Lower					$ 4.00	$ 12.97
Upper					$ 4.00	$ 12.97
Intrinsic value of stock options outstanding	1,700,000
Restricted Stock
Unvested, Beginning Balance (shares)																										1,539,000
Granted (shares)																									31,250	1,620,000
Vested (shares)																										(471,000)
Forfeited (shares)																										(378,000)
Unvested, Ending Balance (shares)																										2,310,000	1,539,000
Weighted Average Grant Date Fair Value (per share)
Unvested, Beginning Balance (usd per share)																										$ 9.38
Granted (usd per share)							$ 2.24	$ 1.70	$ 2.34																$ 12.97	$ 10.21	$ 9.19	$ 10.53
Vested (usd per share)																										$ 8.93
Forfeited (usd per share)																										$ 9.62
Unvested, Ending Balance (usd per share)																										$ 10.01	$ 9.38
Fair value of equity instrument other than options							67,000	86,000	52,000																	4,800,000	5,100,000	3,400,000
Employee Stock Purchase Plan (ESPP), Intrinsic Value of Purchased Shares															86,000
Shares of restricted stock repurchased to satisfy tax withholding obligations	187,000		151,249
Aggregate intrinsic value of restricted shares		34,300,000
Total unrecognized compensation cost related to non-vested restricted shares		13,000,000
Total unrecognized compensation cost, weighted-average recognition period															1 year												2 years 10 months 24 days
Compensation expense related to restricted shares		6,000,000	6,300,000	5,100,000
Percentage of compensation that participating employees can contribute to purchase common stock, minimum														1.00%
Percentage of compensation that participating employees can contribute to purchase common stock, maximum														15.00%
Common shares that participating employees can purchase in any plan year, shares														1,000
Percentage of discount from fair market value that eligible employees can purchase common stock														15.00%
Common shares that participating employees can purchase in any plan year, amount																		25,000
Shares issued under the ESPP										19,048	20,170	20,961	19,823		39,218.000	40,784.000
Shares issued under ESPP, weighted average price (usd per share)										$ 8.15	$ 7.11	$ 7.19	$ 7.00
Weighted Average Expected Option Phantom
Expected term															6 months	6 months	6 months						3 years 9 months
Risk-free rate, minimum															0.08%	0.15%	0.18%						1.40%
Risk-free rate, maximum															0.11%	0.14%	0.16%						1.60%
Expected volatility, minimum															19.90%	29.40%	36.10%						37.00%
Expected volatility, maximum															20.30%	8.30%	21.00%						37.10%
Dividend Yield															0.00%	0.00%	0.00%						0.00%
Compensation expense related to options and ESPP rights							84,000	66,000	60,000
Intrinsic value of ESPP															45,000
Unrecognized compensation cost related to non-vested stock options															8,000
Cash received from exercise of options and ESPP							496,000	295,000	300,000
Tax benefit attributable to all recorded stock-based compensation	3,000,000	2,300,000	2,200,000
Excess Tax Benefit from Share-based Compensation, Operating Activities	305,000	(386,000)	388,000
Excess tax benefits from stock-based awards	$ (305,000)	$ 386,000	$ (388,000)