Stock-based Compensation - Additional Information (Detail)	9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2014	Apr. 30, 2014 Performance Unit Awards 2011	Sep. 30, 2014 Performance Unit Awards 2011	Apr. 17, 2014 2014 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate number of shares of Common Stock authorized for grant under the 2014 Plan				9,100,000
Performance period	3 years
Award description	Generally, the recipients will receive a target number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 50th percentile and two times the target if at the 75th percentile or higher.
Target number of shares			144,375
Shares issued		288,750