Long-Term Obligations - Subordinated Notes (Detail) - Senior Notes [Member] - 2021 Senior Secured Notes [Member]	6 Months Ended
	Jun. 30, 2016
Debt Instrument, Redemption, Period One [Member]
Schedule Of Carrying Amount Of Senior Notes [Line Items]
Debt instrument redemption price percentage	102.375%
Debt instrument redemption period start date	Jul. 15, 2018
Debt Instrument, Redemption, Period Two [Member]
Schedule Of Carrying Amount Of Senior Notes [Line Items]
Debt instrument redemption price percentage	101.188%
Debt instrument redemption period start date	Jul. 15, 2019
Debt Instrument, Redemption, Period Three [Member]
Schedule Of Carrying Amount Of Senior Notes [Line Items]
Debt instrument redemption price percentage	100.00%
Debt instrument redemption period start date	Jul. 15, 2020