Segment Reporting - Information about Operations in Different Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Segment Reporting Information [Line Items]
Non-cash impairment charges		$ 32,000	$ 3,000	$ 4,000
Capital expenditures	[1]	31,900		23,972
Accrued Capital Expenditures of 2015 [Member]
Segment Reporting Information [Line Items]
Capital expenditures		2,000
Accrued Capital Expenditures of 2014 [Member]
Segment Reporting Information [Line Items]
Capital expenditures				3,000
AEA [Member]
Segment Reporting Information [Line Items]
Non-cash impairment charges		$ 32,000
ASA [Member]
Segment Reporting Information [Line Items]
Non-cash impairment charges				$ 4,000

[1] Total capital expenditures represent expenditures for which cash payments were made during the period. Capital expenditures for the three months ended March 31, 2016 exclude $2 million in accrued liabilities related to capital expenditures as of December 31, 2015. Capital expenditures for the three months ended March 31, 2015 include $3 million of cash payments for accrued capital expenditures outstanding as of December 31, 2014.