v3.4.0.3

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		$ (16,343)	$ 29,918
Investing activities:
Purchase of property and equipment		(8,519)	(22,115)
Proceeds from asset dispositions		850
Purchase of short-term investments		(77,677)	(190,243)
Proceeds from sale of short-term investments		76,184	185,426
Payments of deposits on aircraft		(66)	(66)
Net cash used in investing activities		(9,228)	(26,998)
Financing activities:
Proceeds from line of credit		83,500	77,740
Payments on line of credit		(53,300)	(81,100)
Repurchase of common stock		(500)	(2,207)
Net cash provided by (used in) financing activities		29,700	(5,567)
Increase (decrease) in cash		4,129	(2,647)
Cash, beginning of period		2,407	6,270
Cash, end of period		6,536	3,623
Parent Company Only (issuer) [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		(13,795)	4,637
Investing activities:
Purchase of property and equipment		(8,519)	(22,115)
Proceeds from asset dispositions		850
Purchase of short-term investments		(77,677)	(190,243)
Proceeds from sale of short-term investments		76,184	185,426
Payments of deposits on aircraft		(66)	(66)
Net cash used in investing activities		(9,228)	(26,998)
Financing activities:
Proceeds from line of credit		83,500	77,740
Payments on line of credit		(53,300)	(81,100)
Repurchase of common stock		(500)	(2,207)
Due to/from affiliate, net		(6,600)	27,928
Net cash provided by (used in) financing activities		23,100	22,361
Increase (decrease) in cash		77
Cash, beginning of period		46	51
Cash, end of period		123	51
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	[1]	(2,548)	25,281
Financing activities:
Due to/from affiliate, net	[1]	6,600	(27,928)
Net cash provided by (used in) financing activities	[1]	6,600	(27,928)
Increase (decrease) in cash	[1]	4,052	(2,647)
Cash, beginning of period	[1]	2,361	6,219
Cash, end of period	[1]	$ 6,413	$ 3,572
[1] Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.

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