2012 Incentive Compensation Plan - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended						9 Months Ended	0 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended
	Jun. 06, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Employee Stock Option 2012 [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Stock Compensation Plan [Member]	Jul. 31, 2013 Stock Compensation Plan [Member]	Sep. 30, 2014 Stock Compensation Plan [Member] 2012 Plan [Member]	Sep. 30, 2014 SAR [Member]	Jun. 06, 2012 SAR [Member] Chief Operating Officer [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2014 Restricted Stock [Member] 2012 Plan [Member]	Sep. 30, 2014 Restricted Stock [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock repurchased by the company, shares		830,925		830,925		830,925				830,925
Common stock available for issuance											700,000
Share authorized for stock based compensation												1,530,925
Number of shares granted to employees														543,872			185,993
Common stock available for further issuance												801,060
Number of shares granted under SAR Award Agreement	543,872
Common stock, market value per share		$ 22.07		$ 22.07
Valuation dates of common stock under SAR award agreement, description				Commenced after the SAR Grant Date and prior to the 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%		15.00%
Fair value of SAR granted													$ 3.31				$ 71.92
Service period				1 year 9 months 11 days
Expected term to exceed public equivalent value over aggregate exercise price
Expenses for the SAR granted		51,000	126,000	279,000	783,000
Total unrecognized compensation expense		136,000		136,000															6,836,000
Total expected expense				1,800,000
Expected period of recognition of cost				9 months													8 years
Compensation expenses															$ 268,000	$ 131,000	$ 703,000	$ 149,000
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