CCT Agreements - Additional Information (Detail) (USD $)	9 Months Ended	0 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 CCT Agreement [Member]	Sep. 30, 2014 CCT Agreement [Member]	Aug. 24, 2014 CCT Agreement [Member]	Aug. 24, 2014 CCT Agreement [Member] Minimum [Member]	Sep. 30, 2014 Chengshan Group Company Ltd [Member] CCT Agreement [Member]
Merger Related Items [Line Items]
Purchase of equity interest						65.00%
Sale of equity interest						35.00%
Minimum value of joint venture			$ 435,000,000		$ 435,000,000
Number of days for Noncontrolling shareholder option price determined	45 days
Company's equity ownership percentage						65.00%
Noncontrolling interest's equity ownership percentage		35.00%	35.00%			35.00%
Increase in shareholders interest		152,250,000	152,250,000
Adjustment to the noncontrolling shareholders interest liability		0	28,285,000
Valuation amount				437,700,000
Redemption value of redeemable noncontrolling shareholder interest		153,206,000
Carrying value of redeemable noncontrolling shareholder interest	$ 168,435,000	$ 168,435,000	$ 168,435,000