Supplemental Financial Information - Changes in Provision for Bad Debts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Allowance for bad debts, beginning of year	$ 5,724	$ 27,340	$ 5,458
Provision for bad debts			22,513
Recovery of bad debts	0	0	0
Total bad debt expense (recovery)			22,513
Write off of uncollectible accounts against reserve		(21,148)	(509)
Other		(468)	(122)
Allowance for bad debts, end of year	$ 5,724	$ 5,724	$ 27,340