Stock-based Compensation - Additional Information (Detail) - Performance Units Awards	6 Months Ended
	Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period	3 years
Basis of annual percentage exceeds	18.00%
Condition One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award description	Generally, the recipients will receive a target number of shares if the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 50th percentile. If the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 75th percentile or higher, then the recipients will receive two times the target number of shares.
Condition Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award description	if, during the two-year period ending March 31, 2018, the Company’s total shareholder return for any 30 consecutive day period equals or exceeds 18 percent on an annualized basis from April 1, 2013 through the last day of such 30 consecutive day period, and the recipient is actively employed by the Company through the last day of the extended performance period, then the Company will issue to the recipient the number of shares equal to the amount the recipient would have been entitled to receive if the Company’s total shareholder return had been positive during the initial three year performance period.