2012 Incentive Compensation Plan - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	12 Months Ended					0 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended			12 Months Ended		0 Months Ended
	Aug. 28, 2013	Jun. 06, 2012	Aug. 29, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Minimum [Member]	Jun. 17, 2013 Employee Stock Option 2012 [Member]	Dec. 31, 2013 Employee Stock Option 2012 [Member]	Dec. 31, 2013 Stock Compensation Plan [Member]	Jul. 31, 2013 Stock Compensation Plan [Member]	Dec. 31, 2013 Stock Compensation Plan [Member] 2012 Plan [Member]	Jun. 06, 2012 Stock Appreciation Rights (SARs) [Member] Chief Operating Officer [Member]	Dec. 31, 2013 Stock Appreciation Rights (SARs) [Member] Chief Operating Officer [Member]	Jun. 17, 2013 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member] Maximum [Member]	Dec. 31, 2013 Restricted Stock [Member] 2012 Plan [Member]	Dec. 10, 2013 Restricted Stock [Member] Employee Stock Option 2012 [Member]	Oct. 14, 2013 Restricted Stock [Member] Employee Stock Option 2012 [Member]	Oct. 01, 2013 Restricted Stock [Member] Employee Stock Option 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock repurchased by the company, shares				830,925,000	830,925,000						830,925
Common stock available for issuance												700,000
Share authorized for stock based compensation													1,530,925
Number of shares granted to employees	3,000		4,833	0					136,661					543,872	543,872		162,993					1,500	10,000	6,999
Common stock available for further issuance													824,060
Number of shares granted under SAR Award Agreement		543,872
Common stock, market value per share				$ 22.07
Valuation dates of common stock under SAR award agreement, description				Commence after grant date and prior to expiration date
SAR award expiration period from grant date				10 years
Expected term				6 years
Risk-free interest rate		0.92%
Dividend yield				$ 0
Anticipated volatility factor and zero dividend yield		55.00%
Discount on valuation of trading activity				15.00%
Fair value of the SAR granted per share				3.31
Service period				1 year 9 months 11 days
Expected term to exceed public equivalent value over aggregate exercise price
Expenses for the SAR granted				907,000	478,000	0
Total unrecognized compensation expense				415,000													6,404,000	0	0		6,043,000
Restricted stock fair value	51.91		52.28													36.00						71.81	56.28	57.81
Compensation expenses																	$ 361,000
Expected period of recognition of cost																	8 years
Restricted stock agreement vesting										These shares of Restricted Stock vest in various increments and periods over a maximum of ten years from the date the stock was granted as defined under the applicable Restricted Stock Award Agreement.
Vesting period for restricted stock																				10 years